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 ligjt travels from a rarer to a 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, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity in the photon picture of light ?

Explain the following giving reasons : (i) When monochromatic light i

1.	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 ligjt travels from a rarer to a 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, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity in the photon picture of light ?
Answer» Solution :`(i)` Frequencyis INTRINSIC property of a wave, which does not change when it goes from one medium to other. Only WAVELENGTHS and speed of the wave changes. `(ii)` No. Because energy is `E=hv` and `v` remains same. `(iii)` Number of PHOTONS striking PER unit area per unit time.

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