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A laser beam of power 10 W is completely absorbed by a black surface.…
Question
A laser beam of power 10 W is completely absorbed by a black surface. Taking the speed of light as 3.0e8 m/s, find the steady radiation force exerted on the surface, expressed in nanonewton.
✓ Verified answer: 33.3333checked by our engine — not a guess
Step-by-step solution
For complete absorption, force F = power/c (rate of momentum delivered by photons).
F = 10/(3.0e8) = 3.3333e-8 N = 33.3333 nN.
Final answer33.3333
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