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A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time t then force exerted on the surface is ( c= speed of light)

Options

  1. A2 E Atc
  2. BE 2 c
  3. C2 E ct
  4. Dzero

Correct answer

C. 2 E ct

Step-by-step solution

Incident momentum, p= E c For perfectly reflecting surface with normal incidence p=2 p= 2 E c ; F = p t = 2 E c t

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