Free Photons and the Particle Model of Light MCQs with Answers
196 Photons and the Particle Model of Light MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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196 questions · page 3 of 10
- A. Proton
- B. Electron
- C. Neutron
- D. Photon
Explanation: A photon has zero rest mass, although it carries energy and momentum and travels at the speed of light in vacuum.
Correct answer: Photon- A. 10 micrometer
- B. 100 micrometer
- C. 1 micrometer
- D. 2 micrometer
Explanation: A photon's speed is 3x108 m/s (as it is the fundamental particle of light, and this is light's speed), and since the velocity of a wave is…
Correct answer: 1 micrometer- A. 5 x 10^14 Hz
- B. 6 x 10^14 Hz
- C. 7 x 10^14 Hz
- D. 9 x 10^14 H
Explanation: The relation between frequency and wavelength is given by v = fλ. Given that, Speed of light = v = 3 x 108 m/s.Wavelength λ = 500…
Correct answer: 6 x 10^14 Hz- A. Equal
- B. Higher
- C. Lesser
- D. Much higher
Explanation: Laser light is basically just light. Laser light is coherent, that means it has waves of equal frequency and in phase, but other than that…
Correct answer: Equal- A. Spontaneous
- B. Stimulated
- C. Both Options A and B are correct
- D. None of these options are correct
Explanation: Laser light is a type of stimulated emission where one atom is stimulated which further stimulates other atoms to release electromagnetic…
Correct answer: Stimulated- A. Visible light
- B. X rays
- C. Radio waves
- D. Infrared waves
Explanation: X-rays are commonly produced by accelerating (or decelerating) charged particles; examples include a beam of electrons in a synchrotron…
Correct answer: X rays- A. 0.71 x 10^-29 m
- B. 1.66 x 10^29 m
- C. 1.66 x 10^-29 m
- D. 3.77 x 10^-29 m
- E. 5.71 x 10^-29 m
Explanation: The correct de Broglie wavelength is calculated using the formula λ = h/(mv).
Correct answer: 1.66 x 10^-29 m- A. Pair production
- B. Compton effect
- C. Photoelectric effect
- D. Both Options A and B are correct
Explanation: Option A) The pair production process occurs when a high-energy photon interacts with the electromagnetic field of a nucleus, resulting in…
Correct answer: Photoelectric effect- A. He-Ne laser
- B. White
- C. Yellow
- D. All are equal
Explanation: All waves in the electromagnetic spectrum travel at a speed of 3 × 108 m/s.Hence, D is the correct option.
Correct answer: All are equal- A. Visible light
- B. X rays
- C. Radio waves
- D. Infrared
Explanation: The correct answer is X-rays. Electrons, when moving at high speeds, such as in a hydrogen atom or in a particle accelerator, have…
Correct answer: X rays- A. Half the energy of a photon in beam B
- B. One-fourth the energy of a photon in beam B
- C. Equal to the energy of a photon in beam B
- D. Twice the energy of a photon in beam B
Explanation: Since energy is inversely proportional to wavelength, doubling the wavelength cuts the energy in half.
Correct answer: Half the energy of a photon in beam B- A. Long wavelength
- B. Short wavelength
- C. Low frequency
- D. Circular motion
Explanation: The maximum kinetic energy of an electron is given by E = ℎ 𝑓 − 𝑊, m an x where ℎ is the Planck constant, 𝑓 is the frequency of the…
Correct answer: Short wavelength- A. X-rays
- B. Beta rays
- C. Gamma rays
- D. No radiation need medium to travel
Explanation: Option A: X-rays are a form of electromagnetic radiation. Unlike beta particles, X-rays do not require a medium to travel.
Correct answer: Beta rays- A. 10 micrometer
- B. 100 micrometer
- C. 1 micrometer
- D. 2 micrometer
Explanation: A photon's speed is 3x108 m/s (as it is the fundamental particle of light, and this is lights speed) and since velocity of a wave is equal…
Correct answer: 1 micrometer- A. 10 micrometer
- B. 100 micrometer
- C. 1 micrometer
- D. 2 micrometer
Explanation: According to the formula of wavelength λ = c / fwhere c is the speed of light in a vacuum (approximately 3 x 108 meters per second).Plug…
Correct answer: 1 micrometer- A. 4 : 1
- B. 1 : 2
- C. 2 : 1
- D. 1 : 4
Explanation: Since a photon's momentum comes straight from its energy (p = E/c), doubling the energy automatically doubles the momentum.
Correct answer: 2 : 1- A. λ1>λ2
- B. λ1=λ2
- C. λ2>λ1
- D. λ1≥λ2
Explanation: If the second light has a higher frequency than the first, then the first must have the longer wavelength.
Correct answer: λ1>λ2- A. The photoelectric effect
- B. The Compton effect
- C. The relationship between momentum and energy for an electron
- D. The diffraction of electrons by crystals
Explanation: By Davison-Germer the diffraction pattern (diffraction of electrons by crystals) have been observed with electron, protons, neutron…
Correct answer: The diffraction of electrons by crystals- A. Infinite
- B. Zero
- C. Equal to proton
- D. None of the above
Explanation: Photons are massless particles. The rest mass of a photon is zero. Unlike particles with mass, such as electrons or protons, photons do…
Correct answer: Zero60. A photon is a:
- A. Unit of energy
- B. Quantum of electromagnetic radiations
- C. Positively charged particle
- D. Unit of wavelength
Explanation: Potons are the bundles of energy are integral part of electromagnetic radiations and they could not be sub divided.
Correct answer: Quantum of electromagnetic radiations