The Ultimate Electromagnetic Spectrum Quiz
Questions and Answers
- 1.
A group of wavelengths (or) frequencies is known as
- A.
Group of colours
- B.
Spectrum
- C.
Colour band
- D.
None
Correct Answer
B. SpectrumExplanation
A group of wavelengths or frequencies is known as a spectrum. This term is commonly used in physics and refers to the range of colors or frequencies that can be observed in electromagnetic radiation. The spectrum can include visible light as well as other forms of radiation such as ultraviolet or infrared. It is a way to categorize and understand the different wavelengths or frequencies present in a given phenomenon or source of radiation.Rate this question:
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- 2.
Electromagnetic radiations waves are:
- A.
Mechanical
- B.
Longitudinal
- C.
Transverse
- D.
Stationary
Correct Answer
C. TransverseExplanation
Electromagnetic radiation waves are transverse. This means that the oscillations of the waves occur perpendicular to the direction in which the wave is traveling. Unlike mechanical waves, such as sound waves, electromagnetic waves do not require a medium to travel through. They can propagate through a vacuum and are generated by the acceleration of charged particles. Examples of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.Rate this question:
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- 3.
Which of the following emits infrared radiations ?
- A.
Hot iron
- B.
Ice
- C.
Freezing mixture
- D.
Wet cloth
Correct Answer
A. Hot ironExplanation
Hot iron emits infrared radiations because it has a high temperature. Infrared radiation is a form of electromagnetic radiation that is emitted by objects when they are heated. Since hot iron has a high temperature, it emits infrared radiation as heat energy. Ice, freezing mixture, and wet cloth do not emit infrared radiation as they are not hot enough.Rate this question:
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- 4.
The charateristic colour emitted by the substance is depends on
- A.
The colour of the substance
- B.
The state of the substance
- C.
Characteristic properties of the atoms present in the substance
- D.
None
Correct Answer
C. Characteristic properties of the atoms present in the substanceExplanation
The characteristic color emitted by a substance depends on the characteristic properties of the atoms present in the substance. Different atoms have different energy levels and electron configurations, which determine the wavelengths of light they can absorb and emit. When atoms absorb energy, their electrons move to higher energy levels, and when they release energy, the electrons return to their original energy levels, emitting light of specific wavelengths. Therefore, the specific arrangement of atoms and their unique properties dictate the color emitted by a substance.Rate this question:
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- 5.
Longest wavelength of the spectrum
- A.
Radio Waves
- B.
UV Waves
- C.
Visible Light
Correct Answer
A. Radio WavesExplanation
Radio waves have the longest wavelength in the electromagnetic spectrum. They have wavelengths ranging from about one millimeter to hundreds of kilometers. This allows them to travel long distances and penetrate through obstacles such as buildings and trees. Radio waves are used for various purposes including communication, broadcasting, and radar systems. They are also less energetic than UV waves and visible light, making them less harmful to living organisms.Rate this question:
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- 6.
Shortest wavelength of the spectrum
- A.
Microwaves
- B.
Infrared Waves
- C.
Gamma Rays
Correct Answer
C. Gamma RaysExplanation
Gamma rays have the shortest wavelength in the electromagnetic spectrum. They are a form of high-energy electromagnetic radiation and have wavelengths shorter than X-rays. Gamma rays are produced by nuclear reactions and radioactive decay processes. They have the highest frequency and carry the most energy among all types of electromagnetic radiation. Gamma rays are commonly used in medical imaging and cancer treatment due to their ability to penetrate through materials and ionize atoms.Rate this question:
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- 7.
Orange, Yellow, Blue, Green, Indigo
- A.
Microwaves
- B.
Radio Waves
- C.
Visible Light
Correct Answer
C. Visible LightExplanation
The given sequence consists of colors of the rainbow in the order they appear, starting with orange and ending with indigo. The options provided are different types of waves. Among these options, visible light is the only type of wave that is part of the electromagnetic spectrum and corresponds to the colors of the rainbow. Therefore, visible light is the correct answer.Rate this question:
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- 8.
Produced by dying stars
- A.
Visible Light
- B.
Infrared Waves
- C.
Gamma Rays
Correct Answer
C. Gamma RaysExplanation
Gamma rays are produced by dying stars. This high-energy electromagnetic radiation is emitted during certain nuclear reactions, such as supernovae explosions or when a star collapses into a black hole. Gamma rays have the shortest wavelength and the highest frequency among all types of electromagnetic waves. They are often used in medical imaging and cancer treatment due to their ability to penetrate through matter.Rate this question:
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- 9.
How much of the electromagnetic spectrum is visible?
- A.
All of it
- B.
None of it
- C.
Most of it
- D.
Only a small part
Correct Answer
D. Only a small partExplanation
The electromagnetic spectrum consists of a wide range of wavelengths, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Out of all these wavelengths, only a small part is visible to the human eye, which is known as the visible spectrum. The visible spectrum ranges from approximately 400 to 700 nanometers and includes colors from violet to red. Therefore, only a small part of the electromagnetic spectrum is visible to us.Rate this question:
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- 10.
This color has the longest wavelength of visible light:
- A.
Red
- B.
Blue
- C.
Violet
- D.
Yellow
Correct Answer
A. RedExplanation
Red has the longest wavelength of visible light compared to blue, violet, and yellow. Wavelength is the distance between two corresponding points in a wave, and in the visible light spectrum, red light has the longest wavelength. This means that red light has a lower frequency and lower energy compared to the other colors listed.Rate this question:
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- 11.
This type of electromagnetic radiation is the most dangerous to humans:
- A.
X-rays
- B.
Gamma rays
- C.
Microwaves
- D.
Infrared waves
Correct Answer
B. Gamma raysExplanation
Gamma rays are the most dangerous type of electromagnetic radiation to humans. They have the highest frequency and carry the most energy, which makes them capable of penetrating deep into the body and causing damage to cells and DNA. Exposure to gamma rays can lead to various health problems, including radiation sickness, increased risk of cancer, and genetic mutations. X-rays, microwaves, and infrared waves have lower frequencies and carry less energy, making them less harmful to human health compared to gamma rays.Rate this question:
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- 12.
When a sound wave travels through the medium of the air from one side of the room to the other, the particles in the air...
- A.
Travel from one side of the room to the other
- B.
Vibrate slightly and stay where they are
- C.
Travel halfway across the room
- D.
Fall to the ground
Correct Answer
B. Vibrate slightly and stay where they areExplanation
When a sound wave travels through the medium of air, the particles in the air vibrate slightly and stay where they are. This is because sound waves are mechanical waves that transfer energy through the vibration of particles in a medium. As the sound wave passes through the air, it causes the air particles to oscillate back and forth in the direction of the wave. However, these particles do not actually move from one side of the room to the other or fall to the ground. Instead, they vibrate in place, transmitting the energy of the sound wave while remaining in their original positions.Rate this question:
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- 13.
Visible light is an example of:
- A.
Electromagnetic energy
- B.
Sonic waves
- C.
X-rays
Correct Answer
A. Electromagnetic energyExplanation
Visible light is an example of electromagnetic energy because it is a form of radiation that can be detected by the human eye. Electromagnetic energy consists of waves that travel through space and include a wide range of wavelengths, from radio waves to gamma rays. Visible light falls within a specific range of wavelengths and is responsible for the sensation of sight. It is produced by the vibrations of electrically charged particles and can travel through a vacuum.Rate this question:
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- 14.
Electromagnetic waves are transverse waves that transfer
- A.
Sound energy
- B.
Photons
- C.
Electrical energy
- D.
Magnets
Correct Answer
B. PhotonsExplanation
Electromagnetic waves transfer energy in the form of photons. Photons are the fundamental particles of light and carry electromagnetic energy. These waves are transverse in nature, meaning that the oscillations of the electric and magnetic fields occur perpendicular to the direction of wave propagation. While electromagnetic waves can interact with matter and produce various effects, such as the generation of electrical energy or the movement of magnets, the primary form of energy transfer in these waves is through the transmission of photons.Rate this question:
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- 15.
Which of the following is not an example of electromagnetic radiation?
- A.
Dangerous Gamma Rays
- B.
Photons of energy traveling through space
- C.
The sonic boom of a jet
- D.
Wi-fi signals
Correct Answer
C. The sonic boom of a jetExplanation
The sonic boom of a jet is not an example of electromagnetic radiation because it is a result of the shock waves produced by an object moving faster than the speed of sound. Electromagnetic radiation consists of photons of energy traveling through space, such as gamma rays and wi-fi signals.Rate this question:
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- 16.
What is the Electromagnetic Spectrum?
- A.
The range of EM waves according to their frequencies
- B.
The vibration of electrically charged particles that surround the electric field
Correct Answer
A. The range of EM waves according to their frequenciesExplanation
The electromagnetic spectrum refers to the range of electromagnetic waves, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves differ in frequency, with radio waves having the lowest frequency and gamma rays having the highest frequency. Therefore, the correct answer states that the electromagnetic spectrum is defined by the range of EM waves according to their frequencies.Rate this question:
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- 17.
Visible light is light that human can see. What is the range of colors in order?
- A.
Red, Orange, Yellow, Blue, Violet, Green, Indigo
- B.
Red, Orange, Yellow, Green, Blue, Indigo, and Violet
Correct Answer
B. Red, Orange, Yellow, Green, Blue, Indigo, and VioletExplanation
The range of colors in order is known as the visible light spectrum. It starts with red, followed by orange, yellow, green, blue, indigo, and violet. This order is based on the wavelength of each color, with red having the longest wavelength and violet having the shortest.Rate this question:
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- 18.
Light travels in...?
- A.
A limo
- B.
Curved lines. If it didn't, we wouldn't be able to see.
- C.
Straight lines
- D.
By bus. It's the easiest, cheapest and most economical way.
- E.
The day time
Correct Answer
C. Straight linesExplanation
Light travels in straight lines because it is a form of electromagnetic radiation that moves in a linear path. This is known as the principle of rectilinear propagation. When light encounters a medium with a different refractive index, such as air to water, it may change direction, but it still follows a straight line within that medium. The ability of light to travel in straight lines allows us to see objects and perceive the world around us.Rate this question:
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- 19.
The distance between A and F is the _____________.
- A.
Frequency
- B.
Period
- C.
Amplitude
- D.
Wavelength
Correct Answer
D. WavelengthExplanation
The distance between A and F is referred to as the wavelength. Wavelength is a term used in physics to describe the distance between two consecutive points in a wave that are in phase. It is commonly represented by the Greek letter lambda (λ) and is measured in meters. In the context of this question, the distance between A and F is being compared to the characteristics of a wave, and wavelength is the most appropriate term to describe this distance.Rate this question:
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- 20.
If the velocity of the wave is 400 m/s and the wavelength is 2m, what is its frequency?
- A.
200 Hz
- B.
800 Hz
- C.
20 Hz
- D.
400 Hz
Correct Answer
A. 200 HzExplanation
The frequency of a wave can be calculated by dividing the velocity of the wave by its wavelength. In this case, the velocity of the wave is given as 400 m/s and the wavelength is given as 2m. By dividing 400 m/s by 2m, we get a frequency of 200 Hz.Rate this question:
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- 21.
A lightbulb that glows when a filament inside it gets hot is a
- A.
Flourescent light
- B.
Incandescent light
- C.
Neon light
- D.
Vapor light
Correct Answer
B. Incandescent lightExplanation
An incandescent light bulb is a type of light bulb that produces light by heating a filament inside it until it glows. This is achieved by passing an electric current through the filament, which has a high resistance and therefore gets very hot. The heat causes the filament to emit light, creating illumination. This type of light bulb is commonly used in households and has been widely used for many years.Rate this question:
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- 22.
Radar is a system that uses reflected radio waves to
- A.
Detect objects and measure their speed
- B.
Cook food
- C.
Carry AM signals
- D.
Kill bacteria
Correct Answer
A. Detect objects and measure their speedExplanation
Radar is a system that uses reflected radio waves to detect objects and measure their speed. By sending out radio waves and analyzing the reflected waves, radar can determine the presence and location of objects in its vicinity. Additionally, by measuring the Doppler shift of the reflected waves, radar can calculate the speed of the detected objects. This technology is widely used in various applications such as air traffic control, weather monitoring, and military surveillance.Rate this question:
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- 23.
The amount of energy carried by an electromagnetic wave increases with frequency. Which of the following groups of waves is listed in order of increasing energy?
- A.
X-rays, visible light, radio waves
- B.
Infrared waves, visible light, radio waves
- C.
Radio waves, visible light, x-rays
- D.
Visible light, gamma rays, x-rays
Correct Answer
C. Radio waves, visible light, x-raysExplanation
The correct answer is radio waves, visible light, x-rays. This is because the amount of energy carried by an electromagnetic wave increases with frequency. Radio waves have the lowest frequency and therefore the lowest energy. Visible light has a higher frequency and energy than radio waves. X-rays have the highest frequency and energy among the given options.Rate this question:
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- 24.
This device separates visible light into its individual component wavelengths
- A.
Telescope
- B.
X-ray
- C.
Spectroscope
- D.
Flux capacitor
Correct Answer
C. SpectroscopeExplanation
A spectroscope is a device that separates visible light into its individual component wavelengths. It is used to analyze the different wavelengths of light emitted or absorbed by a substance, allowing scientists to identify the chemical composition of the substance. This device is commonly used in various fields such as astronomy, chemistry, and physics to study the properties of light and gain insights into the composition of different materials.Rate this question:
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