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Question

Light with an energy flux of 25×104Wm2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is
  1. 1.25×106N
  2. 2.50×106N
  3. 1.20×106N
  4. 3.0×106N


Solution

The correct option is B 2.50×106N
Fav=2IAc=2×25×104×15×1043×108=250×108N=2.5×106N

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