Light with an energy flux of 18 W cm –2 falls on a non-reflecting surface at normal…
Physics · Class 12 · CBSE — Electromagnetic Waves
Light with an energy flux of 18 W cm–2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm2, the average force exerted on the surface during a 30 minute time span is
- 2.1 × 10–6 N
- 1.2 × 10–6 N
- 1.2 × 106 N
- 2.1 × 106 N
Answer
(B) 1.2 × 10 –6 N
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