# Light Test: Physics Quiz! Trivia

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| By Erin1193
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Quizzes Created: 1 | Total Attempts: 2,323
Questions: 19 | Attempts: 2,325

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• 1.

### Only the wave theory of light offers an explanation for the ability of light to exhibit.

• A.

Interference

• B.

Reflection

• C.

Photoelectric emission

• D.

A. Interference
Explanation
The wave theory of light is the only explanation that can account for the phenomenon of interference. Interference occurs when two or more light waves interact with each other, resulting in the reinforcement or cancellation of certain parts of the waves. This can only be explained by the wave theory, which states that light is a wave that can undergo superposition and interference. The other options, such as reflection, photoelectric emission, and intensity of radiation, do not involve the interaction of light waves and therefore cannot explain interference.

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• 2.

### Which two characteristics of light can best be explained by the wave theory of light?

• A.

Relection and refraction

• B.

Reflection and interference

• C.

Refraction and diffraction

• D.

Interference and diffraction

D. Interference and diffraction
Explanation
The wave theory of light explains interference and diffraction. Interference occurs when two or more waves combine and either reinforce or cancel each other out, resulting in a pattern of light and dark areas. Diffraction is the bending of light waves around obstacles or through narrow openings, causing the waves to spread out. Both phenomena can be explained by the wave nature of light, where light is considered as a wave that can interfere with itself and diffract when encountering obstacles or openings.

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• 3.

### Which phenomenon can be observed for transverse waves only?

• A.

Reflection

• B.

Diffraction

• C.

Polarization

• D.

Refraction

C. Polarization
Explanation
Polarization is a phenomenon that can only be observed in transverse waves. Transverse waves are waves in which the particles of the medium vibrate perpendicular to the direction of wave propagation. Polarization refers to the alignment of these vibrations in a specific direction. It occurs when the transverse waves are filtered or restricted to only vibrate in one plane. Reflection, diffraction, and refraction can occur in both transverse and longitudinal waves, but polarization is unique to transverse waves.

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• 4.

### Sources that produce waves with a constant phase relation are said to be:

• A.

Polarized

• B.

Diffused

• C.

Refracted

• D.

Coherent

D. Coherent
Explanation
Coherent sources are those that produce waves with a constant phase relation. This means that the waves emitted by these sources have a consistent and predictable pattern of peaks and troughs. This coherence allows the waves to interfere constructively, resulting in a well-defined and stable waveform. Polarized, diffused, and refracted sources do not necessarily have a constant phase relation, so they are not the correct answer in this context.

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• 5.

### If all parts of a light beam have a constant phase relationship, with the same wavelength and frequency, the light beam is

• A.

Monochromatic and coherent

• B.

Mono and incoherent

• C.

Polychromatic and coherent

• D.

Poly and incoherent

A. Monochromatic and coherent
Explanation
If all parts of a light beam have a constant phase relationship, with the same wavelength and frequency, it means that the light beam consists of only one color or wavelength, making it monochromatic. Additionally, since the phase relationship is constant, it indicates that the waves in the beam are in sync and have a fixed phase difference, which implies coherence. Therefore, the correct answer is monochromatic and coherent.

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• 6.

### The diffraction pattern produced by a double slit will show greatest separation of maxima when the color of the light source is

• A.

Red

• B.

Orange

• C.

Blue

• D.

Green

A. Red
Explanation
The diffraction pattern produced by a double slit will show greatest separation of maxima when the color of the light source is red. This is because red light has the longest wavelength among the given options. According to the principle of diffraction, the separation between the maxima increases as the wavelength of light decreases. Therefore, since red light has the longest wavelength, it will result in the greatest separation of maxima in the diffraction pattern.

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• 7.

### If the wavelength of the light is decreased, the width of the central maximum in the diffraction pattern will

• A.

Decrease

• B.

Increase

• C.

Remain the same

A. Decrease
Explanation
When the wavelength of light is decreased, the central maximum in the diffraction pattern will decrease in width. This is because the width of the central maximum is directly proportional to the wavelength of light. As the wavelength decreases, the diffraction of light becomes more pronounced, causing the central maximum to become narrower. Therefore, the correct answer is decrease.

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• 8.

### A wave is diffracted as it passes through an opening in a barrier. The amount of diffraction that the wave undergoes depends on both the

• A.

Amplitude and frequency of the incident wave

• B.

Wavelength and speed of the incident wave

• C.

Wavelength of the incident wave and size of the opening

• D.

Amplitude of the incicdent wave and the size of the opening

C. Wavelength of the incident wave and size of the opening
Explanation
The amount of diffraction that a wave undergoes when passing through an opening in a barrier depends on the wavelength of the incident wave and the size of the opening. Diffraction is the bending of waves around obstacles or through openings, and it is more pronounced when the size of the opening is similar to the wavelength of the wave. Therefore, the wavelength of the incident wave and the size of the opening are the factors that determine the extent of diffraction.

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• 9.

### If the screen is moved closer to the slits, the distance between the central maximum and the first maximum will

• A.

Decrease

• B.

Increase

• C.

Remain the same

A. Decrease
Explanation
When the screen is moved closer to the slits, the distance between the central maximum and the first maximum will decrease. This is because the distance between the slits and the screen is reduced, causing the diffraction pattern to become more spread out. As a result, the angles at which the maxima occur become smaller, leading to a decrease in the distance between the central maximum and the first maximum.

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• 10.

### If the distance between the slits is decreased, the distance between the central max and the first max will

• A.

Decrease

• B.

Increase

• C.

Remain the same

B. Increase
Explanation
When the distance between the slits is decreased, it means that the slits are closer together. This causes the interference pattern to spread out more, resulting in a larger distance between the central maximum and the first maximum. Therefore, the distance between the central max and the first max will increase.

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• 11.

### The photon model of light is more appropriate than the wave model in explaining

• A.

Interference

• B.

Refraction

• C.

Polarization

• D.

Photoelectric emission

D. pHotoelectric emission
Explanation
The photon model of light is more appropriate than the wave model in explaining photoelectric emission. This is because photoelectric emission involves the ejection of electrons from a material when it is exposed to light. The photon model describes light as discrete packets of energy called photons, which can transfer their energy to electrons and cause them to be emitted. On the other hand, the wave model of light does not provide a satisfactory explanation for this phenomenon.

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• 12.

### Light demonstartes the characteristics of

• A.

Particles only

• B.

Waves only

• C.

Both particles and waves

• D.

Neither

C. Both particles and waves
Explanation
Light demonstrates the characteristics of both particles and waves. This is known as the wave-particle duality of light. The wave nature of light is observed through phenomena such as interference and diffraction, where light waves can interfere with each other and bend around obstacles. On the other hand, the particle nature of light is demonstrated through the photoelectric effect and the emission and absorption of discrete packets of energy called photons. This dual nature of light is a fundamental concept in quantum mechanics.

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• 13.

### Interference and diffraction can be explained by:

• A.

The wave theory only

• B.

The particle theory only

• C.

Neither

• D.

Both

A. The wave theory only
Explanation
Interference and diffraction can be explained by the wave theory only because both phenomena involve the interaction of waves. Interference occurs when two or more waves meet and combine to create regions of constructive or destructive interference. Diffraction occurs when waves encounter an obstacle or pass through a narrow opening, causing them to spread out and bend around the edges. These phenomena cannot be explained by the particle theory, which describes particles as discrete entities that do not exhibit wave-like behavior.

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• 14.

### The color of visible light is determined by its:

• A.

Frequency

• B.

Amplitude

• C.

Intensity

• D.

Speed

A. Frequency
Explanation
The color of visible light is determined by its frequency. Frequency refers to the number of wave cycles that pass a given point in a second. Different frequencies of light correspond to different colors in the visible spectrum. This is because each color represents a different wavelength, and wavelength and frequency are inversely proportional. So, light with a higher frequency will have a shorter wavelength and appear as a color towards the violet end of the spectrum, while light with a lower frequency will have a longer wavelength and appear as a color towards the red end of the spectrum.

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• 15.

### Increasing the amplitude of electromagnetic radiation increases its

• A.

Frequency

• B.

Speed

• C.

Intensity

• D.

Period

C. Intensity
Explanation
Increasing the amplitude of electromagnetic radiation refers to increasing the strength or magnitude of the waves. This does not affect the frequency, speed, or period of the radiation. However, it does affect the intensity of the radiation. Intensity refers to the amount of energy carried by the waves per unit area per unit time. So, increasing the amplitude increases the intensity of the radiation.

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• 16.

### Compared to the period of red light, the period of violet light is

• A.

Less

• B.

Greater

• C.

Same

A. Less
Explanation
The period of light refers to the time it takes for one complete cycle of the wave. Violet light has a shorter wavelength compared to red light, which means it has a higher frequency. Since frequency is inversely proportional to the period, a higher frequency corresponds to a shorter period. Therefore, the period of violet light is less than the period of red light.

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• 17.

### Compared to the period of a wave of red light, the period of a wave of blue light is

• A.

Less

• B.

Greater

• C.

Same

A. Less
Explanation
The period of a wave refers to the time it takes for one complete cycle of the wave to occur. Red light has a longer wavelength compared to blue light, which means that it takes a longer time for a complete cycle of red light to occur. Therefore, the period of a wave of red light is greater than the period of a wave of blue light.

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• 18.

### Electrons oscillating with a frequency of 2.0X10 10 hertz produce electromagnetic waves. These waves would be classified as

• A.

Infrared

• B.

Visible

• C.

Microwave

• D.

X-ray

C. Microwave
Explanation
Electromagnetic waves are classified based on their frequency and wavelength. In this case, the electrons are oscillating with a frequency of 2.0X10^10 hertz, which falls within the range of microwave frequencies. Therefore, the electromagnetic waves produced by these oscillating electrons would be classified as microwave waves.

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• 19.

### Which pair of terms best describes light waves traveling from the Sun to Earth?

• A.

Electromagnetic and transverse

• B.

Electromagnetic and longitudinal

• C.

Mechanical and transverse

• D.

Mechanical and longitudinal

A. Electromagnetic and transverse
Explanation
Light waves are a form of electromagnetic waves, as they are composed of oscillating electric and magnetic fields. These waves travel in a transverse manner, meaning that the oscillations occur perpendicular to the direction of wave propagation. Therefore, the pair of terms that best describes light waves traveling from the Sun to Earth is "electromagnetic and transverse."

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Mar 04, 2010
Quiz Created by
Erin1193

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