Modern Physics Theories Quiz: Trivia!
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Are you interested in modern physics theories? Modern physics is a division of physics that includes quantum physics, special relativity, and general relativity. Classical physics is typically concerned with every-day problems. This problem-solving includes speeds that are relatively lower than the speed of light, sizes that are bigger than atoms, and rather small energies. Modern physics involves the examination of extreme conditions. This quiz will help you understand current physics theories. All the best.
Questions and Answers
- 1.
When light is directed at a metal surface, the energies of the emitted electrons:
- A.
Vary with the intensity of the light
- B.
Vary with the frequency of the light
- C.
Vary with the speed of the light
- D.
Are random
Correct Answer
B. Vary with the frequency of the lightExplanation
The correct answer is that the energies of the emitted electrons vary with the frequency of the light. This is because the energy of a photon is directly proportional to its frequency. When light interacts with a metal surface, the photons transfer their energy to the electrons in the metal. The electrons can only absorb energy in discrete amounts, called quanta or photons. The energy of these photons is determined by the frequency of the light. Therefore, the energies of the emitted electrons will vary with the frequency of the light.Rate this question:
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- 2.
The photoelectric effect can be understood on the basis of:
- A.
The electromagnetic theory of light
- B.
The interference of light waves
- C.
The special theory of relativity
- D.
None of these
Correct Answer
D. None of theseExplanation
The photoelectric effect cannot be understood on the basis of the electromagnetic theory of light because it fails to explain certain observations, such as the fact that the energy of the ejected electrons depends on the frequency of the incident light rather than its intensity. Similarly, the interference of light waves and the special theory of relativity also do not provide a satisfactory explanation for the photoelectric effect. Therefore, none of these theories can fully explain the phenomenon.Rate this question:
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- 3.
In a vacuum, all photons have the same_____________
- A.
Frequency
- B.
Wavelength
- C.
Energy
- D.
Speed
Correct Answer
D. SpeedExplanation
In a vacuum, all photons have the same speed. This is because the speed of light in a vacuum is a constant, known as the speed of light in a vacuum, denoted by "c". Regardless of their frequency, wavelength, or energy, all photons travel at this same speed. This fundamental property of photons is a key principle in the theory of relativity and has been experimentally verified.Rate this question:
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- 4.
The mass of a photon:
- A.
Is 0
- B.
Is the same as that of an electron
- C.
Depends on its frequency
- D.
Is the size of the x-rays emitted
Correct Answer
A. Is 0Explanation
Photons are elementary particles that have zero rest mass. They are the fundamental particles of light and electromagnetic radiation. According to the theory of relativity, anything that has zero rest mass must always travel at the speed of light. Therefore, the mass of a photon is indeed 0.Rate this question:
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- 5.
The rate at which an object emits electromagnetic energy does not depend on its:
- A.
Surface area
- B.
Mass
- C.
Temperature
- D.
Ability to absorb radiation
Correct Answer
B. MassExplanation
The rate at which an object emits electromagnetic energy is determined by its temperature and ability to absorb radiation. The surface area of the object affects the total amount of energy emitted, but not the rate. Mass, on the other hand, does not have an impact on the rate of energy emission. Therefore, the correct answer is mass.Rate this question:
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- 6.
When the speed of the electrons that strike a metal surface is increased, the result is an increase in
- A.
The number of x-rays emitted
- B.
The frequency of the x-rays emitted
- C.
The speed of the x-rays emitted
- D.
The size of the x-rays emitted
Correct Answer
B. The frequency of the x-rays emittedExplanation
When the speed of the electrons that strike a metal surface is increased, the result is an increase in the frequency of the x-rays emitted. This is because the energy of the electrons is directly proportional to their speed. As the speed increases, so does their energy. When these high-energy electrons collide with the metal surface, they transfer their energy to the metal atoms, causing them to emit x-rays. The frequency of the emitted x-rays is directly related to the energy of the electrons, so an increase in electron speed leads to an increase in x-ray frequency.Rate this question:
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- 7.
A phenomenon that cannot be understood with the help of the quantum theory of light is
- A.
The photoelectric effect
- B.
X-ray production
- C.
The spectrum of an element
- D.
Interference of light
Correct Answer
D. Interference of lightExplanation
The correct answer is interference of light. The quantum theory of light explains the behavior of light as both particles (photons) and waves. The photoelectric effect, x-ray production, and the spectrum of an element can all be understood using the principles of quantum theory. However, interference of light is a phenomenon that occurs when two or more light waves interact and produce a pattern of constructive or destructive interference. This phenomenon is better explained by classical wave theory rather than the quantum theory of light.Rate this question:
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- 8.
According to the theories of modern physics, light
- A.
Is exclusively a wave phenomenon
- B.
Is exclusively a particle phenomenon
- C.
Combines wave and particle properties
- D.
Has neither wave nor particle properties
Correct Answer
C. Combines wave and particle propertiesExplanation
According to the theories of modern physics, light is believed to exhibit both wave and particle properties. This concept is known as wave-particle duality. This means that light can behave as a wave in some situations, such as interference and diffraction, and as a particle, called a photon, in other situations, such as the photoelectric effect. This dual nature of light has been experimentally observed and is a fundamental principle in understanding the behavior of light in various phenomena.Rate this question:
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- 9.
According to the theories of modern physics,
- A.
Only stationary particles exhibit wave behavior
- B.
Only moving particles exhibit wave behavior
- C.
Only charged particles exhibit wave behavior
- D.
All particles exhibit wave behavior
Correct Answer
B. Only moving particles exhibit wave behaviorExplanation
According to the theories of modern physics, only moving particles exhibit wave behavior. This is because wave behavior is a characteristic of particles with momentum, and momentum is only possessed by moving particles. Stationary particles do not have momentum and therefore do not exhibit wave behavior. Similarly, charged particles may exhibit wave behavior, but this is not a requirement for wave behavior as not all particles are charged. Therefore, the correct answer is that only moving particles exhibit wave behavior.Rate this question:
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- 10.
The speed of the wave packet that corresponds to a moving particle is
- A.
Less than the particle's speed
- B.
Equal to the particle's speed
- C.
More than the particle's speed
- D.
Any of these, depending on the circumstances
Correct Answer
B. Equal to the particle's speedExplanation
The speed of the wave packet that corresponds to a moving particle is equal to the particle's speed. This is because the wave packet represents the probability distribution of the particle's position and momentum. The wave packet moves with the same velocity as the particle, as they are both manifestations of the same underlying quantum entity. Therefore, the speed of the wave packet is equal to the speed of the particle.Rate this question:
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- 11.
De Broglie waves can be regarded as waves of:
- A.
Pressure
- B.
Probability
- C.
Electric charge
- D.
Momentum
Correct Answer
B. ProbabilityExplanation
De Broglie waves can be regarded as waves of probability. This is because de Broglie waves are associated with the wave-particle duality of matter, where particles can exhibit both wave-like and particle-like properties. The de Broglie wavelength is inversely proportional to the momentum of a particle, indicating that the wave nature of a particle becomes more pronounced as its momentum decreases. This wave nature is described by a probability wave, which represents the likelihood of finding the particle at a particular position. Thus, de Broglie waves are directly related to the probability distribution of a particle's position.Rate this question:
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- 12.
The description of a moving body in terms of matter waves is legitimate because:
- A.
It is based upon common sense
- B.
Matter waves have actually been seen
- C.
The analogy with electromagnetic waves is plausible
- D.
Theory and experimental agree
Correct Answer
D. Theory and experimental agreeExplanation
The explanation for the given correct answer is that the legitimacy of describing a moving body in terms of matter waves is supported by the fact that theory and experimental results align with each other. This means that the predictions made by the theoretical framework of matter waves have been validated through experiments, providing evidence for their existence and behavior. The agreement between theory and experiment strengthens the credibility and validity of describing a moving body using matter waves.Rate this question:
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- 13.
The narrower the wave packet of a particle is:
- A.
The shorter its wavelength
- B.
The more precisely its position can be established
- C.
The more precisely its momentum can be established
- D.
The more precisely its energy can be established
Correct Answer
B. The more precisely its position can be establishedExplanation
When the wave packet of a particle is narrower, it means that the particle's position is more localized. This allows for a more precise determination of its position. A narrower wave packet indicates a smaller range of possible positions for the particle, increasing the certainty of its location. Therefore, the more precisely the position of the particle can be established when the wave packet is narrower.Rate this question:
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- 14.
According to the uncertainty principle, it is impossible to precisely determine at the same time a particle's
- A.
Position and change
- B.
Position and momentum
- C.
Momentum and energy
- D.
Charge and mass
Correct Answer
B. Position and momentumExplanation
According to the uncertainty principle, it is impossible to precisely determine the position and momentum of a particle at the same time. This principle, proposed by Werner Heisenberg, states that the more accurately we try to measure the position of a particle, the less accurately we can determine its momentum, and vice versa. This is due to the inherent wave-particle duality of quantum mechanics, where particles can exhibit both wave-like and particle-like properties. Therefore, the more precisely we try to measure one property, the more uncertain the other property becomes.Rate this question:
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- 15.
If Planck's constant were larger than it is,
- A.
Moving bodies would have shorter wavelengths
- B.
Moving bodies would have higher energies
- C.
Moving bodies would have greater charges
- D.
The uncertainity principle would be significant on a larger scale
Correct Answer
D. The uncertainity principle would be significant on a larger scaleExplanation
If Planck's constant were larger than it is, the uncertainty principle would be significant on a larger scale. The uncertainty principle states that there is a fundamental limit to the precision with which certain pairs of physical properties of a particle, such as position and momentum, can be known simultaneously. A larger Planck's constant would increase the uncertainty in these measurements, making the uncertainty principle more significant on a larger scale. This means that the precise values of these properties would be less certain, leading to a greater degree of uncertainty in the behavior of moving bodies.Rate this question:
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- 16.
THe emission spectrum produced by the excited atoms of an element contains frequencies that are
- A.
The same for all elements
- B.
Characteristic of the particular element
- C.
Evenly distributed throughout the entire visible spectrum
- D.
Different from the frequencies in its absorption spectrum
Correct Answer
B. Characteristic of the particular elementExplanation
The emission spectrum produced by the excited atoms of an element contains frequencies that are characteristic of the particular element. This means that each element has its own unique set of frequencies that it emits when its atoms are excited. These frequencies can be used to identify and distinguish between different elements.Rate this question:
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- 17.
A neon sign does not produce
- A.
A line spectrum
- B.
An emission spectrum
- C.
An absorption spectrum
- D.
Photons
Correct Answer
C. An absorption spectrumExplanation
A neon sign does not produce an absorption spectrum because it emits light through the process of fluorescence. In fluorescence, the neon gas is excited by an electric current, causing the electrons to move to higher energy levels. When the electrons return to their original energy levels, they emit light of specific wavelengths, creating an emission spectrum. Unlike an absorption spectrum, which occurs when atoms absorb specific wavelengths of light, a neon sign only emits light and does not absorb any specific wavelengths.Rate this question:
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- 18.
Most stars are hot objects surrounded by a cooler atmosphere. The spectrum of such a star is a
- A.
Continuous band of light
- B.
Band of light crossed by brighter lines
- C.
Band of light crossed by dark lines
- D.
Series of bright lines
Correct Answer
C. Band of light crossed by dark linesExplanation
The correct answer is "band of light crossed by dark lines". This answer is based on the concept of absorption lines in a star's spectrum. When light passes through a star's cooler atmosphere, certain wavelengths are absorbed by the elements present in the atmosphere, creating dark lines in the spectrum. These dark lines correspond to the specific elements and their energy levels. Thus, the spectrum of a star consists of a continuous band of light with these dark absorption lines, indicating the presence of different elements in the star's atmosphere.Rate this question:
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- 19.
The classical model of the hydrogen atom falls because
- A.
An accelerated electron radiates electromagnetic waves
- B.
A moving electron has more mass than an electron at rest
- C.
A moving electron has more charge than an electron at rest
- D.
The attractive force of the nucleus is not enough to keep an electron in orbit around it
Correct Answer
A. An accelerated electron radiates electromagnetic wavesExplanation
The classical model of the hydrogen atom falls because an accelerated electron radiates electromagnetic waves. When an electron is in motion, it experiences acceleration, and according to classical electromagnetic theory, any accelerated charged particle emits electromagnetic radiation. This radiation causes the electron to lose energy and spiral into the nucleus, which contradicts the stable orbits predicted by the classical model. This phenomenon is known as the "radiation problem" and was one of the main reasons for the development of quantum mechanics to explain the behavior of atoms.Rate this question:
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- 20.
An electron can revolve in an orbit around an atomic nucleus without radiating energy provided that the orbit
- A.
Is far enough away from the nucleus
- B.
Is less than a de Broglie wavelength in circumference
- C.
Is a whole number of de Broglie wavelengths in circumference
- D.
Is a perfect circle
Correct Answer
C. Is a whole number of de Broglie wavelengths in circumferenceExplanation
According to the de Broglie wavelength theory, particles such as electrons can exhibit wave-like behavior. The wavelength of a particle is inversely proportional to its momentum. In the given question, it states that an electron can revolve in an orbit without radiating energy. This implies that the electron's energy remains constant, which can only happen if the electron's wave remains in phase with itself after completing one orbit. This condition is satisfied when the circumference of the orbit is a whole number of de Broglie wavelengths. Therefore, the correct answer is that the orbit is a whole number of de Broglie wavelengths in circumference.Rate this question:
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- 21.
According to the Bohr model of the atom, an electron in the ground state
- A.
Radiates electromagnetic energy continuously
- B.
Emits only spectral lines
- C.
Remains there forever
- D.
Can jump to another orbit if given enough energy
Correct Answer
D. Can jump to another orbit if given enough energyExplanation
According to the Bohr model of the atom, an electron in the ground state can jump to another orbit if given enough energy. This is because the Bohr model suggests that electrons exist in specific energy levels or orbits around the nucleus, and they can transition between these levels by either absorbing or emitting energy. When an electron absorbs enough energy, it can move to a higher energy level or orbit, and when it releases energy, it moves back to a lower energy level. Therefore, if an electron in the ground state receives sufficient energy, it can jump to a higher orbit.Rate this question:
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- 22.
In the Bohr model of the atom, the electrons revolve around the nucleus of an atom so as to
- A.
Emit spectral lines
- B.
Produce x-rays
- C.
Form energy levels that depend upon their speeds only
- D.
Keep from falling into the nucleus
Correct Answer
D. Keep from falling into the nucleusExplanation
The electrons in the Bohr model of the atom revolve around the nucleus in order to keep from falling into the nucleus. This is because the electrons are attracted to the positively charged nucleus, and without the centripetal force provided by their motion, they would be pulled into the nucleus. The Bohr model proposed that electrons occupy specific energy levels or orbits, and the motion of the electrons in these orbits prevents them from collapsing into the nucleus.Rate this question:
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- 23.
A hydrogen atom is said to be in its ground state when its electron
- A.
Is at rest
- B.
Is inside the nucleus
- C.
Is in its lowest energy level
- D.
Has escaped from the atom
Correct Answer
C. Is in its lowest energy levelExplanation
When a hydrogen atom is in its ground state, it means that its electron is in its lowest energy level. In the ground state, the electron is in the closest orbit to the nucleus and has the least amount of energy. This is the most stable configuration for a hydrogen atom.Rate this question:
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- 24.
An atom emits a photon when one of its orbital electrons.
- A.
Jumps from a higher concentration to a lower energy level
- B.
Jumps from a lower to a higher energy level
- C.
Is removed by the photoelectric effect
- D.
Is struck by an x-ray
Correct Answer
A. Jumps from a higher concentration to a lower energy levelExplanation
When an atom emits a photon, it means that one of its orbital electrons moves from a higher energy level to a lower energy level. This transition results in the release of energy in the form of a photon. The electron jumps to a lower energy level because it loses energy and returns to a more stable state. This process is known as an electron transition or electron relaxation.Rate this question:
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- 25.
The energy difference between adjacent energy levels in the hydrogen atom.
- A.
Is smaller for small quantum numbers
- B.
Is the same for all quantum numbers
- C.
Is larger for small quantum numbers
- D.
Has no regularity
Correct Answer
C. Is larger for small quantum numbersExplanation
The energy difference between adjacent energy levels in the hydrogen atom is larger for small quantum numbers because as the quantum number increases, the energy levels become closer together. This is because the energy levels in the hydrogen atom are inversely proportional to the square of the quantum number. Therefore, as the quantum number decreases, the energy difference between adjacent levels increases.Rate this question:
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- 26.
When an atom absorbs a photon of light, which one or more of the following can happen?
- A.
An electron shifts to a state of smaller quantum number
- B.
An electron shifts to a state of higher quantum number
- C.
An electron leaves the atom
- D.
An x-ray photon is emitted
- E.
B and C
Correct Answer
E. B and CExplanation
When an atom absorbs a photon of light, an electron can shift to a state of higher quantum number, which means it moves to a higher energy level. Additionally, an electron can also leave the atom, resulting in ionization. Therefore, the correct answer is B and C.Rate this question:
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- 27.
Which of the following types of radiation is not emitted by the electronic structures of atoms?
- A.
Ultraviolet light
- B.
Visible light
- C.
X-rays
- D.
Gamma rays
Correct Answer
D. Gamma raysExplanation
Gamma rays are not emitted by the electronic structures of atoms. While ultraviolet light, visible light, and x-rays are all forms of electromagnetic radiation that can be emitted by atoms, gamma rays are a type of high-energy radiation that is typically emitted from nuclear reactions or radioactive decay. They have a shorter wavelength and higher frequency than x-rays, and are more penetrating and dangerous to living organisms.Rate this question:
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- 28.
The operation of the laser is based upon:
- A.
The uncertainty principle
- B.
The interference of de Broglie waves
- C.
Stimulated emission of radiation
- D.
Stimulated absorption of radiation
Correct Answer
C. Stimulated emission of radiationExplanation
The operation of a laser is based on stimulated emission of radiation. In a laser, atoms or molecules are stimulated to emit photons of light through a process called stimulated emission. This occurs when an incoming photon interacts with an excited atom, causing it to release a second photon that is identical in frequency, phase, and direction. This process creates a chain reaction, with each emitted photon stimulating the emission of more photons, resulting in a coherent and intense beam of light. The other options, such as the uncertainty principle and the interference of de Broglie waves, are not directly related to the operation of a laser.Rate this question:
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- 29.
Which of the following properties is not characteristic of the light waves from a laser?
- A.
The waves all have the same frequency
- B.
The waves are all in step with one another
- C.
The waves form a narrow beam
- D.
The waves have higher photon energies than light waves of the same frequency from an ordinary source
Correct Answer
D. The waves have higher photon energies than light waves of the same frequency from an ordinary sourceExplanation
The waves from a laser have higher photon energies than light waves of the same frequency from an ordinary source. This is because laser light is produced by stimulated emission, where photons are emitted in phase with each other and have higher energy levels. In contrast, light waves from an ordinary source, such as an incandescent bulb, are produced by thermal radiation and do not have the same coherence or energy levels as laser light.Rate this question:
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- 30.
The quantum-mechanical theory of the atom is
- A.
Based upon a mechanical model of the atom
- B.
A theory that restricts itself to physical quantities that can be measured directly
- C.
Less accurate than the Bohr theory of the atom
- D.
Impossible to reconcile with Newton's laws of motion
Correct Answer
B. A theory that restricts itself to physical quantities that can be measured directlyExplanation
The quantum-mechanical theory of the atom is a theory that restricts itself to physical quantities that can be measured directly. This means that it focuses on observable properties of the atom, such as position, momentum, and energy, rather than attempting to describe the atom in terms of classical mechanical concepts like orbits or trajectories. The theory recognizes that certain properties of particles, such as their exact position and momentum, cannot be simultaneously known with certainty, leading to the concept of uncertainty in quantum mechanics.Rate this question:
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- 31.
The orbital of an atomic electron is
- A.
Its orbit around the atom's nucleus
- B.
Its de Broglie wave
- C.
Its probability cloud
- D.
One of its quantum numbers
Correct Answer
C. Its probability cloudExplanation
The orbital of an atomic electron refers to its probability cloud. This means that the electron does not have a fixed path or orbit around the nucleus, but rather exists in a region around the nucleus where there is a high probability of finding the electron. The probability cloud represents the likelihood of finding the electron at different points in space, and it is determined by the electron's energy level and quantum numbers.Rate this question:
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- 32.
How many quantum numbers are needed to determine the size and shape of an atomic orbital?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
C. 3Explanation
To determine the size and shape of an atomic orbital, three quantum numbers are needed. The principal quantum number (n) determines the size and energy level of the orbital. The azimuthal quantum number (l) determines the shape of the orbital, such as s, p, d, or f orbitals. The magnetic quantum number (ml) determines the orientation of the orbital in space. Therefore, these three quantum numbers together provide the necessary information to determine the size and shape of an atomic orbital.Rate this question:
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- 33.
An electron in a p state of an atom has an angular momentum quantum number l of
- A.
0
- B.
1
- C.
2
- D.
3
Correct Answer
B. 1Explanation
The angular momentum quantum number (l) describes the shape of the electron's orbital. In the case of a p state, the possible values for l are -1, 0, and 1. Since the question states that l is 1, it means that the electron in the p state has a specific angular momentum quantum number of 1.Rate this question:
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- 34.
An s orbital
- A.
Is spherical in shape
- B.
Is shaped like a doughnut
- C.
Has two lobes
- D.
Has six lobes
Correct Answer
A. Is spherical in shapeExplanation
The correct answer is "is spherical in shape" because an s orbital is a type of atomic orbital that is spherically symmetrical around the nucleus. It does not have any lobes or doughnut-like shapes.Rate this question:
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- 35.
A quantum number is not associated with an atomic electron's:
- A.
Mass
- B.
Energy
- C.
Spin
- D.
Orbital angular momentum
Correct Answer
A. MassExplanation
A quantum number is a value that describes a specific property of an atomic electron. The mass of an electron is not considered a quantum number because it is a constant property of the electron and does not change. Quantum numbers, such as energy, spin, and orbital angular momentum, are associated with the behavior and characteristics of electrons in an atom.Rate this question:
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- 36.
Electrons behave like:
- A.
Pure changes with no magnetic properties
- B.
Tiny bar magnets with different strengths that never change
- C.
Tiny bar magnets with strengths that may change
- D.
Tiny bar magnets with the same strength that never changes
Correct Answer
D. Tiny bar magnets with the same strength that never changesExplanation
Electrons behave like tiny bar magnets with the same strength that never changes. This means that electrons have a magnetic property and their strength remains constant. This behavior is essential in understanding the magnetic properties of materials and their interactions with magnetic fields.Rate this question:
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- 37.
The electrons in an atom all have the same:
- A.
Speed
- B.
Spin magnitude
- C.
Orbit
- D.
Principal quantum numbers
Correct Answer
B. Spin magnitudeExplanation
The correct answer is spin magnitude. Electrons in an atom all have the same spin magnitude, which refers to the intrinsic angular momentum of the electron. This property determines the electron's behavior in a magnetic field and is quantized, meaning it can only have certain discrete values. The spin magnitude of an electron can be either +1/2 or -1/2, representing the two possible spin orientations.Rate this question:
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- 38.
According to the exclusion principle, no two electrons in an atom can have the same:
- A.
Spin direction
- B.
Speed
- C.
Orbit
- D.
Set of quantum numbers
Correct Answer
D. Set of quantum numbersExplanation
The exclusion principle states that no two electrons in an atom can have the same set of quantum numbers. Quantum numbers describe the specific properties of an electron such as its energy level, orbital shape, orientation, and spin. Since each electron in an atom must have a unique combination of quantum numbers, it ensures that electrons occupy different energy levels and orbitals within an atom. This principle plays a crucial role in determining the electronic configuration and behavior of atoms.Rate this question:
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