Mathematics · Electromagnetic Waves
If an average force of 2.5 × 10-6 N is exerted by a light wave on a non-reflecting surface of 30 cm2 area during a 40 min time span under complete absorption and normal incidence conditions, find the energy flux of the light just before it falls on the surface.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 150 W cm-2
- 225 W cm-2✓
- 345 W cm-2
- 415 W cm-2
Correct answer
25 W cm-2
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