Question

Assertion (A) : In Compton scattering the scattered photon, the recoil electron and the incident photon are coplanar
Reason (R) : In Compton scattering energy is conserved.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

Answer: (B)

Both A and R are true but R is not the correct explanation of A

Answer is B.

A photon of wavelength $\lambda$ cornes & collides with an $e^{-}$ and a scattered photon of wavelength ${\lambda }^{\prime }$ emerges at an abgle $\theta$
So thet are coplanar.
We know, mass - energy & momentum of a system both must be conserved.