Electromagnetic Waves and Wave Optics: EM Wave Pressure MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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EM Wave PressureMediumQuestion 20194

Question

Radiation pressure P on a perfectly absorbing surface for an EM wave of intensity I is:

A
I/c
Correct
B
Ic
C
I/c²
D
2I/c

Correct answer

I/c

Explanation

For total absorption: P = I/c. For perfect reflection: P = 2I/c (momentum is reversed). Radiation pressure is the basis for the concept of solar sails in space propulsion.

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