Fundamentals Of Quantum Physics

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Questions: 10 | Attempts: 254 | Updated: Mar 18, 2023

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Based on theory, the quantum physics shows and explains the interaction between matter and energy.

Questions and Answers

1.

Quantum mechanics is called the science of what?
- A.
  
  The very large
- B.
  
  The very small
- C.
  
  The big
- D.
  
  The colossal
Correct Answer
B. The very small

Explanation
Quantum mechanics is called the science of the very small because it deals with the behavior of particles at the atomic and subatomic level. It explains the fundamental properties and interactions of these particles, such as electrons and photons, and how they behave in various physical systems. Quantum mechanics is essential in understanding phenomena like wave-particle duality, superposition, and entanglement, which are not observable at larger scales.

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2.

Quantum physics explains the interaction between?
- A.
  
  Energy
- B.
  
  Energy and Nuclear
- C.
  
  Atomic and Molecules
- D.
  
  Matter and energy
Correct Answer
D. Matter and energy

Explanation
Quantum physics is a branch of physics that deals with the behavior of matter and energy at the smallest scales. It explains how particles and energy interact with each other, providing a framework to understand phenomena such as particle-wave duality and quantum entanglement. Therefore, the correct answer is "Matter and energy" because quantum physics specifically focuses on the interaction between these two fundamental components of the universe.

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3.

The electromagnetic radiation emitted from the surface of an object due to the object's internal energy is known as?
- A.
  
  Photon
- B.
  
  Nuclear Radiation
- C.
  
  Thermal Radiation
- D.
  
  Spectra Emission
Correct Answer
C. Thermal Radiation

Explanation
Thermal radiation refers to the electromagnetic radiation that is emitted from the surface of an object due to its internal energy. This type of radiation is produced when the object's atoms and molecules vibrate and move, resulting in the emission of photons. Unlike nuclear radiation, which is associated with the decay of atomic nuclei, or spectra emission, which refers to the specific wavelengths of light emitted by atoms, thermal radiation is directly related to the object's temperature and is commonly observed as heat or infrared radiation.

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4.

Which of the following laws was the first quantum theory in physics?
- A.
  
  Faraday's Law
- B.
  
  Uncertainty Principle
- C.
  
  Lewi's Law
- D.
  
  Planck's Law
Correct Answer
D. Planck's Law

Explanation
Planck's Law was the first quantum theory in physics. Proposed by Max Planck in 1900, it introduced the concept of energy being quantized into discrete packets called quanta. This theory revolutionized our understanding of light and laid the foundation for the development of quantum mechanics. Faraday's Law, Lewi's Law, and the Uncertainty Principle are important principles in physics, but they are not considered the first quantum theory.

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5.

The emission of electron from the surface of a metal is called?
- A.
  
  The photoelectric effect
- B.
  
  Compton
- C.
  
  Blackbody Radiation
- D.
  
  X-ray Spectra
Correct Answer
A. The photoelectric effect

Explanation
The emission of electrons from the surface of a metal is called the photoelectric effect. This phenomenon occurs when light of a certain frequency, known as the threshold frequency, strikes the metal surface and causes the electrons to be ejected. The photoelectric effect was first explained by Albert Einstein and is an important concept in quantum physics. It has numerous applications, including solar panels and photodetectors.

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6.

Who discovered the photoelectric effect?
- A.
  
  Micheal Faraday
- B.
  
  Isaac Newton
- C.
  
  Heinrich Hertz
- D.
  
  Hertz
Correct Answer
C. Heinrich Hertz

Explanation
Heinrich Hertz discovered the photoelectric effect. The photoelectric effect refers to the emission of electrons from a material when it is exposed to light or other forms of electromagnetic radiation. Hertz conducted experiments in the late 19th century that demonstrated this phenomenon, providing evidence for the particle-like behavior of light and laying the foundation for the development of quantum mechanics. His work was instrumental in advancing our understanding of the interaction between light and matter.

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7.

Who predicted that matter acts as a wave?
- A.
  
  Rutherford
- B.
  
  Heinrich Hertz
- C.
  
  Heisberg
- D.
  
  Louis de Broglie
Correct Answer
D. Louis de Broglie

Explanation
Louis de Broglie predicted that matter acts as a wave. This is known as the wave-particle duality theory, which suggests that particles such as electrons and protons can exhibit both wave-like and particle-like behavior. De Broglie's theory was based on the observation that particles can have wave-like properties, just like light can have particle-like properties. This idea was later confirmed by experiments, leading to the development of quantum mechanics.

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8.

The energy required by an electron to escape from the surface of a given metal is called?
- A.
  
  Threshold frequency
- B.
  
  Threshold Effect
- C.
  
  Work Function
- D.
  
  The photoelectric effect
Correct Answer
C. Work Function

Explanation
The energy required by an electron to escape from the surface of a given metal is known as the work function. This energy is specific to each metal and is determined by the strength of the attractive forces between the electrons and the metal atoms. When the energy of incident photons is greater than the work function, electrons can be emitted from the metal surface in a process known as the photoelectric effect. The work function is an important concept in understanding the behavior of electrons in metals and their interaction with light.

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9.

The momentum and the position of a particle cannot simultaneously be measured with complete certainty, is based on what assumption?
- A.
  
  The uncertainty principle
- B.
  
  Relativity Theory
- C.
  
  Plank's theory
- D.
  
  Particle duality
Correct Answer
A. The uncertainty principle

Explanation
The uncertainty principle states that it is impossible to simultaneously measure the momentum and position of a particle with complete certainty. This principle is based on the assumption that there is inherent uncertainty in the nature of particles, and that the act of measuring one property of a particle will necessarily disturb the measurement of the other property. This principle was proposed by Werner Heisenberg in 1927 and has been a fundamental concept in quantum mechanics ever since.

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10.

The ability of an object in quantum theory to be in more than one quantum state at the same is know as?
- A.
  
  Wave-particle duality
- B.
  
  Decoherence
- C.
  
  Nonlocality
- D.
  
  Superposition
Correct Answer
D. Superposition

Explanation
Superposition refers to the ability of an object in quantum theory to exist in multiple quantum states simultaneously. This means that the object can be in a combination or "superposition" of different states until it is measured or observed, at which point it collapses into a single state. This concept is a fundamental principle in quantum mechanics and is essential to understanding the behavior of particles at the quantum level.

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Fundamentals Of Quantum Physics

Quantum mechanics is called the science of what?

Quantum physics explains the interaction between?

The electromagnetic radiation emitted from the surface of an object due to the object's internal energy is known as?

Which of the following laws was the first quantum theory in physics?

The emission of electron from the surface of a metal is called?

Who discovered the photoelectric effect?

Who predicted that matter acts as a wave?

The energy required by an electron to escape from the surface of a given metal is called?

The momentum and the position of a particle cannot simultaneously be measured with complete certainty, is based on what assumption?

The ability of an object in quantum theory to be in more than one quantum state at the same is know as?