Q155 / 160 · AP EAMCET 2021 (23 Aug Shift 2) · Physics

Assertion (A) Electromagnetic waves exert pressure, called radiation pressure. Reason (R) This is because they carry energy.

  • A
    Both $A$ and $R$ are true and $R$ is a correct explanation for $\mathrm{A}$.
  • Correct answer
    B
    Both $A$ and $R$ are true but $R$ is not a correct explanation for $\mathrm{A}$.
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false but $R$ is true.

Solution

Electromagnetic waves (EMW) exerts pressure, called radiation pressure. In perfect reflecting waves, $p=2 I / C$ In perfect absorbing waves, $p=I / C$ So, Assertion is true. EMW exert pressure on the surface because they carry energy also. Therefore reason is also true. But, Reason (R) is not a correct explanation of Assertion (A).

Hence, the correct answer is option: 'B'.

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