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PhysicsNEET 2024Photoelectric effect and Einstein's equation

Dual Nature of Radiation and Matter

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

A. The energy of a photon is E=hνE = h\nu.

B. The velocity of a photon is cc.

C. The momentum of a photon is p=hνcp = \dfrac{h\nu}{c}.

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

E. A photon possesses positive charge.

Choose the correct answer from the options given below:

  1. A.A, B, C and D only✓
  2. B.A, C and D only
  3. C.A, B, D and E only
  4. D.A and B only

Solution

A photon has energy hνh\nu, moves at cc, carries momentum p=hν/cp = h\nu/c, and photon–electron collisions conserve both energy and momentum. A photon is uncharged, so E is false. Hence A, B, C and D only.

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