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An object is placed in a medium of refractive index 3 . An electromagnetic wave of intensity 6 × 10 8 W m - 2 falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space = 3 × 10 8 m s - 1 ):

Options

  1. A36 N m - 2
  2. B18 N m - 2
  3. C6 N m - 2
  4. D2 N m - 2

Correct answer

C. 6 N m - 2

Step-by-step solution

The formula to calculate the radiation pressure is given by P = I v . . . 1 Also, the velocity of the electromagnetic wave can be expressed as μ = c v . . . 2 Equations (1) and (2) imply that P = I · μ c = 6 × 10 8 × 3 3 × 10 8 = 6 N m - 2

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