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 7 of 10
- A. high-energy proton
- B. High-energy electrons
- C. High-energy -rays
- D. High-energy photons
Explanation: X-rays are a form of electromagnetic radiation similar to visible light.
Correct answer: High-energy photons- A. Electron
- B. Proton
- C. Neutron
- D. Alpha particle
Explanation: The wavelength of a particle is inversely proportional to its momentum. Momentum is given by the product of mass and velocity.
Correct answer: Alpha particle- A. Visible light
- B. X-rays
- C. Ultraviolet light
- D. γ-rays
Explanation: Gamma rays have the highest energy because they are at the extreme end of the electromagnetic spectrum, characterized by very short…
Correct answer: γ-rays- A. P= mc
- B. P=mc^2
- C. P= Ec
- D. P= m^2c
Explanation: the momentum of a photon is given by a different equation. The momentum of a photon is given by the equation p = E/c, where p is the…
Correct answer: P= mc- A. The kinetic energy of all emitted electrons is hv0
- B. The kinetic energy of all emitted electrons is h (v-v0)
- C. The kinetic energy of the fastest electron is h (v-v0)
- D. The kinetic energy of all emitted electrons is hv
Explanation: The remaining energy hv-hv0 will be maximum kinetic energy that ejected electrons can have.View the attached image for further explanation.
Correct answer: The kinetic energy of the fastest electron is h (v-v0)- A. Zero
- B. Equal to the mass of electron
- C. Equal to the mass of proton
- D. Infinite
Explanation: Photons, being massless particles, have a rest mass of zero. According to special relativity, photons always travel at the speed of light…
Correct answer: Zero- A. 5.00 x 10^-25 Ns
- B. 5.00 x 10^-26 Ns
- C. 5.00 x 10^-43 Ns
- D. 5.00 x 10^-44Ns
Explanation: Using de broglie's wavelength mv=h/𝞴 Where h is planck's constant whose value is 6.6x10-³⁴J.s =6.6x10-³⁴/1.32x10-⁹ =5x10-²⁵ N.s Ans
Correct answer: 5.00 x 10^-25 Ns- A. E = hvc
- B. E = c/λ
- C. E = hv
- D. E =nλ/c
Explanation: The energy associated with a single photon is given by E = h ν , where E is the energy (SI units of J), h is Planck's constant (h = 6.626…
Correct answer: E = hv- A. 1.7 x 10^-15J
- B. 1.32 x 10^-19J
- C. 1.1 x 10^-27J
- D. 1.1 x 10^-48J
Explanation: The correct answer is 1.326x10^-19.Changes: making option B 1.326x10^-19 Explanation: As , E = hv E = hc / lamda E= (6.63X10^-34)…
Correct answer: 1.32 x 10^-19J130. A ball of mass 1g is moving with a velocity of 10³ m/s. The De_Broglie wavelength of the ball is:
- A. 13.26 × 10^-36 m
- B. 3.315 × 10-³⁴ m
- C. 6.63 × 10-³⁴ m
- D. 4.97 × 10^-26 m
Explanation: momentum= 1/1000 Kg×1000m/s λ= Ph = 1 6.6×10−34J/s /1=6.6×10 −34mOPTION (A,B and D) are incorrect.As, it is a numerical so it could have…
Correct answer: 6.63 × 10-³⁴ m- A. Photon
- B. Proton
- C. Meson
- D. Positron
Explanation: A single quantum of electromagnetic radiation is called a "photon." Photons are elementary particles that represent a discrete amount of…
Correct answer: Photon- A. Pair production
- B. Compton effect
- C. Photoelectric effect
- D. A & B are correct
Explanation: Option A: Pair production is a process in which a photon interacts with a nucleus or an electron and produces an electron-positron pair.
Correct answer: Photoelectric effect- A. The threshold frequency for the metal surface
- B. The intensity of incident light
- C. The frequency of incident light and the work function for metal surface
- D. The threshold energy for the metal surface
Explanation: The current is same but stopping potential is different for each frequency of incident lightThis fact shows that maximum K.E.
Correct answer: The frequency of incident light and the work function for metal surface- A. 1/2 MV2max = hf +Φ
- B. 1/2 MV2max = hf - Φ
- C. 1/2 MV2max - hf = Φ
- D. 1/2 MV2max - Φ = hf
Explanation: Energy of photon = work function + Max. K.E. of photoelectron
Correct answer: 1/2 MV2max = hf - Φ- A. Red
- B. Yellow
- C. Blue
- D. radio wave
Explanation: As wavelength of radio wave is greatest than others. So. its photon has least momentum.
Correct answer: radio wave- A. Photoelectric emission does not occur below the threshold frequency
- B. The photoelectric current increases with the frequency of incident light
- C. Threshold frequency depends on the metal used
- D. The emission of photoelectrons is an instantaneous process
Explanation: In photoelectric effect Electrons are emitted instantaneously; the intensity of light determines only their numbers.
Correct answer: The photoelectric current increases with the frequency of incident light137. Photon A has twice the energy of photon B. What is the ratio of the momentum of A to that of B?
- A. 4:1
- B. 2:1
- C. 1:1
- D. 1:2
Explanation: The momentum ( P ) of a photon is directly proportional to its energy ( E ), as given by the equation P = E.c where ( c ) is the speed of…
Correct answer: 2:1- A. Electron
- B. Proton
- C. Neutron
- D. a- particle
Explanation: The particle with the shortest wavelength, when all particles have the same velocity, is the one with the highest mass.
Correct answer: a- particle- A. Photoelectric effect
- B. Compton effect
- C. Pair Production
- D. Diffraction
Explanation: The phenomenon that does not verify the particle nature of light is diffraction.
Correct answer: Diffraction140. The maximum kinetic energy of emitted photoelectrons, from different metal surfaces, depends upon:
- A. Intensity of incident light only
- B. Frequency of the incident light only
- C. Nature of metal surface
- D. Both frequency of incident light and nature of metal surface
Explanation: The maximum kinetic energy of emitted photoelectrons depends on both the frequency of the incident light and the nature of the metal…
Correct answer: Both frequency of incident light and nature of metal surface