# Engineering Physics Questions and Answers – Compton Effect

This set of Engineering Physics Multiple Choice Questions & Answers (MCQs) focuses on “Compton Effect”.

1. Wien’s displacement law holds good only for shorter wavelength.
a) False
b) True

Explanation: The product of the wavelength corresponding to maximum energy and the absolute temperature is constant, according to this law. If is smaller than 1, then 1/ will be fantastic. As a result, e(hc/KT) will be excellent.

2. Which of the following does not affect the photon?
a) Magnetic or electric field
b) Light waves
c) Gravity
d) Current

Explanation: Photons do not have a charge. They have the ability to interact with charged particles but not with each other. This is why photons are unaffected by magnetic or electric fields and remain neutral.

3. What is Compton shift?
a) Shift in frequency
b) Shift in charges
d) Shift in wavelength

Explanation: When a photon collides with a stationary electron, the photon gives the electron its energy. As a result, the wavelength of the scattered photon will be longer than the wavelength of the input photon. Compton shift is the term for this wavelength shift.

4. Compton shift depends on which of the following?
b) Nature of scattering substance
c) Angle of scattering
d) Amplitude of frequency

Explanation: Change in wavelength = h/mc (1-cos) is calculated using the Compton effect theory. This equation demonstrates that the wavelength shift is independent of the incident radiation as well as the scattering substance’s composition. The shift is solely determined by the scattering angle.

5. Which of the following is called as non-mechanical waves?
a) Magnetic waves
b) Electromagnetic waves
c) Electrical waves
d) Matter waves

Explanation: Electromagnetic waves are waves that travel in the form of oscillating electric and magnetic waves. Non-mechanical waves are waves that do not require the use of any material to propagate.

6. Which of the following is associated with an electron microscope?
a) Matter waves
b) Electrical waves
c) Magnetic waves
d) Electromagnetic waves

Explanation: Matter waves are the waves that are connected with tiny particles in motion. The matter waves associated with fast moving electrons are used in electron microscopes.

7. A radio station broadcasts its programme at 219.3 metre wavelength. Determine the frequency of radio waves if velocity of radio waves is 3×108 m/s.
a) 7.31×10-7 Hz
b) 1.954×10-6 Hz
c) 1.368×106 Hz
d) 6.579×1010 Hz

Explanation: ʎ = velocity/frequency
Frequency = velocity/ʎ
Therefore, frequency = 1.368×106 Hz.

8. Calculate the de-Broglie wavelength of an electron which has been accelerated from rest on application of potential of 400volts.
a) 0.1653 Å
b) 0.5125 Å
c) 0.6135 Å
d) 0.2514 Å

Explanation: de-Broglie wavelength = h/√(2×m×e×V)
De-Broglie wavelength = (6.625×10-14)/√(2×9.11×10-31×1.6×10-19×400)
Wavelength = 0.6135 Å.

9. Which of the following is the characteristic of a black body?
a) A perfect absorber but an imperfect radiator
b) A perfect radiator but an imperfect absorber
c) A perfect radiator and a perfect absorber
d) A perfect conductor

Explanation: When radiation passes through a dark body, it is reflected several times before being totally absorbed. The heat radiations will come out when it is placed in a temperature bath at a fixed temperature. As a result, a black body is both a perfect absorber and reflector.

10. The energy distribution is not uniform for any given temperature in a perfect black body.
a) True
b) False

Explanation: When a perfect black body is permitted to emit radiations at different temperatures, the distribution of energy for different wavelengths at different temperatures is not uniform.

11. Rayleigh-Jean’s law holds good for which of the following?
a) Shorter wavelength
b) Longer wavelength
c) High temperature
d) High energy

Explanation: The energy distribution is directly proportional to the absolute temperature and inversely proportional to the wavelength’s fourth power, according to this law. As a result, the greater the energy distribution, the longer the wavelength.

The scattering of a photon following an encounter with a charged particle, usually an electron, was discovered by Arthur Holly Compton. The Compton effect is defined as a decrease in energy (increase in wavelength) of a photon (which could be an X-ray or gamma ray photon). A portion of the photon’s energy is passed to the recoiling electron. When a charged particle transfers some of its energy to a photon, this is known as inverse Compton scattering. The energy distribution is directly proportional to the absolute temperature and inversely proportional to the wavelength’s fourth power, according to this law.