STANDARD Physics Radiation Pressure MCQ Question
An electromagnetic wave of intensity I falls on a surface kept in vacuum and exerts radiation pressure P on it. Which of the following statement is not true?
Radiation pressure is I/c if the wave is totally absorbed.
Radiation pressure is I/c if the wave is totally reflected.
Radiation pressure is 2I/c if the wave is totally reflected.
Radiation pressure is 2I/c if the wave is totally absorbed.
Correct Answer
Detailed Explanation
When a wave is totally reflected, the radiation pressure is 2I/c, not I/c. The pressure doubles because the momentum change is twice as much when the wave is reflected compared to when it is absorbed.
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