Physics Electromagnetic Induction SZABMU 2024
PMDC Verified Question 3 of 69
Which one of the following factors is the best for calculation Compton's shift?
A
Angular spin of electron
B
Energy of electron
C
Energy of photon
D
Scattering angle of photon
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Scattering angle of photon
Concept:

Compton's shift describes the increase in wavelength of X-rays or gamma rays scattered by electrons.

Formula:

$$ \Delta \lambda = \frac{h}{m_0 c} (1 - \cos\theta) $$

Solution:

  • In the Compton shift equation, \( h \), \( m_0 \) (rest mass of an electron), and \( c \) are fundamental constants.


  • The only variable that determines the magnitude of the shift (\( \Delta \lambda \)) is \( \theta \), which is the scattering angle of the photon.


Why other options are incorrect:

While the energy of the incident photon determines the initial wavelength, the actual shift (difference in wavelength) depends entirely on the angle at which it scatters. Electron spin has no role in this kinematic equation.

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