physics : class12 Particle-Wave Duality : Particle Nature of Light : Dual Nature of Matter and Radiation MCQ Questions and Answers
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Particle-Wave Duality
MCQ questions and answers.
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MCQ Questions
1. What does particle-wave duality of light mean?
A.
Light behaves only as a particle
B.
Light behaves only as a wave
C.
Light can show both wave and particle properties
D.
Light has no physical properties
Correct Answer:
Light can show both wave and particle properties
Explanation:
Particle-wave duality means that light exhibits wave-like behavior in phenomena such as interference and particle-like behavior in phenomena such as the photoelectric effect.
2. Which phenomenon demonstrates the wave nature of light?
A.
Photoelectric effect
B.
Compton effect
C.
Interference
D.
Emission of electrons
Correct Answer:
Interference
Explanation:
Interference is produced by the superposition of light waves, so it demonstrates the wave nature of light.
3. Which phenomenon provides evidence for the particle nature of light?
A.
Diffraction
B.
Interference
C.
Polarisation
D.
Photoelectric effect
Correct Answer:
Photoelectric effect
Explanation:
The photoelectric effect is explained by light transferring energy in discrete packets called photons, showing the particle nature of light.
4. According to the photon concept, light energy is transferred in the form of
A.
Continuous waves only
B.
Discrete packets called photons
C.
Stationary particles only
D.
Electric charges
Correct Answer:
Discrete packets called photons
Explanation:
In the particle description of light, energy is carried and transferred in discrete packets called photons.
5. Which statement about a photon is correct?
A.
A photon is a particle of light
B.
A photon is a massive charged particle
C.
A photon remains at rest
D.
A photon exists only in water
Correct Answer:
A photon is a particle of light
Explanation:
A photon is the smallest packet, or quantum, of electromagnetic radiation and represents the particle aspect of light.
6. The energy of a photon is directly proportional to its
A.
Wavelength
B.
Frequency
C.
Speed in vacuum squared
D.
Amplitude only
Correct Answer:
Frequency
Explanation:
The photon energy is given by E = hν, so its energy is directly proportional to the frequency of light.
7. Which equation represents the energy of a photon?
A.
E = mc
B.
E = hν
C.
E = ν/h
D.
E = h/ν
Correct Answer:
E = hν
Explanation:
The energy of a photon is given by E = hν, where h is Planck's constant and ν is the frequency of light.
8. When light behaves like a wave, which property is commonly observed?
A.
Quantised energy transfer
B.
Interference patterns
C.
Emission of photoelectrons
D.
Photon momentum transfer only
Correct Answer:
Interference patterns
Explanation:
Interference patterns arise from the wave nature of light and are produced when light waves superpose.
9. When light behaves like particles, it transfers energy
A.
Continuously at all values
B.
In discrete amounts
C.
Without any interaction
D.
Only as sound energy
Correct Answer:
In discrete amounts
Explanation:
The particle model states that light transfers energy in discrete amounts, with each amount equal to the energy of a photon.
10. Which statement best describes the relationship between the wave and particle descriptions of light?
A.
Only the wave description is valid
B.
Only the particle description is valid
C.
Both descriptions are needed to explain different observations
D.
Neither description explains light
Correct Answer:
Both descriptions are needed to explain different observations
Explanation:
Light shows wave-like behavior in some experiments and particle-like behavior in others, so both descriptions are required for a complete understanding.
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