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  • Explain the following, giving reasons: (i) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. (ii)When light travels from a rar

Explain the following, giving reasons:
(i) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency.
(ii)When light travels from a rarer to denser medium, the speed decreases. Does this decrease in speed imply a reduction in the energy carried by the wave?
(iii)In the wave picture of light, the intensity of light is determined by the square of the amplitude of the wave. What determines the intensity in the photon picture of light?

 

 

 

 
 
 
 
 

Answers (1)

(i) The atomic constituent of matter vibrates with the same frequency as that of the incident light. Since the refraction and reflection occur through the interaction of light with the atomic constituent of matter the frequency remains unchanged
(ii) The energy of a photon depends on frequency. Light when travels from rarer to denser to medium the frequency remains unchanged. So the energy carried does not change
(iii) In photon picture of light the intensity depends on the number of electron incident on the unit area in unit time.

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Safeer PP

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