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A plane electromagnetic wave of intensity of $10 W / m^{2}$ strikes a small mirror of area $20 {cm}^{2}$ , held perpendicular to the approaching wave. The radiation force on the mirror will be

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6.6 × 10−11 N

1.33 × 10−11 N

1.33 × 10−10 N

6.6 × 10−10 N

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detailed solution

Correct option is C

Radiation force = momentum transferred per second by electromagnetic wave to the mirror=2SavAc=2×(10)×20×10−43×108=1.33 × 10−10 N

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A plane electromagnetic wave of intensity of 10 W/m2 strikes a small mirror of area 20 cm2, held perpendicular to the approaching wave. The radiation force on the mirror will be

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Ready to Test Your Skills?

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A plane electromagnetic wave of intensity of $10 W / m^{2}$ strikes a small mirror of area $20 {cm}^{2}$ , held perpendicular to the approaching wave. The radiation force on the mirror will be