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Question: Answered & Verified by Expert
A light with an energy flux of $18 \mathrm{~W} \mathrm{~cm}^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \mathrm{~cm}^2$, the average force exerted on the surface during a 30 minute time span is ____ $\left(c=3 \times 10^8 \mathrm{~ms}^{-1}\right)$.
PhysicsDual Nature of MatterAP EAMCETAP EAMCET 2017 (24 Apr Shift 2)
Options:
  • A $1.2 \times 10^{-6} \mathrm{~N}$
  • B $2.1 \times 10^{-6} \mathrm{~N}$
  • C $3.1 \times 10^{-6} \mathrm{~N}$
  • D $4.8 \times 10^{-6} \mathrm{~N}$
Solution:
1252 Upvotes Verified Answer
The correct answer is: $1.2 \times 10^{-6} \mathrm{~N}$
No solution. Refer to answer key.

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