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Solution


Q.

If c is the velocity of light in free space, the correct statements about photon among the following are

A.  The energy of a photon is E=hυ.

B.  The velocity of a photon is c.

C.  The momentum of a photon, p=hυc.

D.  In a photon-electron collision, both total energy and total momentum are conserved.

E.  Photon possesses positive charge.

Choose the correct answer from the options given below.                                  [2024]
1 A and B only  
2 A, B, C and D only  
3 A, C and D only  
4 A, B, D and E only  

Ans.

(2)

Photon is the massless and chargeless stable particle which moves with the velocity of light.

Energy of photon, E=hυ

where h is Planck's constant and υ is frequency of photon.

Its momentum is given by, p=Ec=hυc

In a photon-electron collision both total energy and total momentum are conserved.