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Electromagnetic Waves — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Waves1 Mark
MCQ
Radiation pressure on any surface:
  • A
    Is dependent on wavelength of the light used
  • B
    Is dependent on nature of surface and intensity of light used
  • C
    Is dependent on frequency and nature of surface
  • D
    Depends on the nature of source from which light is coming and on nature of surface on which it is falling.
✓

Answer

  1. Is dependent on nature of surface and intensity of light used

Explanation:

Radiation pressure is given by $\text{P}_\text{R}=\frac{(1+\alpha)\text{I}}{\text{C}}$

where α is the coefficient of reflection of the surface.

For completely reflecting surface $\alpha=1$

For completely absorbing surface $\alpha=0$

So, radiation pressure depends on the nature of surface on which the light is falling but independent of wavelength of light falling.

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