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8. Electromagnetic waves — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics8. Electromagnetic waves1 Mark
MCQ
Given below are two statements:

Statement $I$: Electromagnetic waves carry energy as they travel through space and this energy is equally shared by the electric and magnetic fields.

Statement $II$: When electromagnetic waves strike a surface, a pressure is exerted on the surface.In the light of the above statements, choose the most appropriate answer from the options given below:

  • A
     Statement $I$ is incorrect but Statement $II$ is correct
  • ✓
    Both Statement $I$ and Statement $II$ are correct.
  • C
    Both Statement $I$ and Statement $II$ are incorrect.
  • D
    Statement $I$ is correct but Statement $II$ is incorrect.
✓

Answer

Correct option: B.
Both Statement $I$ and Statement $II$ are correct.
b
$\frac{1}{2} \varepsilon_0 \mathrm{E}^2=\frac{\mathrm{B}^2}{2 \mu_0}$

$\because \mathrm{E}=\mathrm{CB} \text { and } \mathrm{C}=\frac{1}{\mu_0 \varepsilon_0}$

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