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BITSAT2020PhysicsDual Nature of MatterActual

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 timet then average pressure exerted on the surface is ( c = speed of light )

Options

  1. Azero
  2. BE / Atc
  3. C2 E / Atc
  4. DE / c

Correct answer

C. 2 E / Atc

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 ct P = F A = 2 E ctA

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