Question

1. Explain Doppler effect in light.
Distinguish between red shift and blue
shift.
[TS 151​

Answer 1

<hey MATE>

1. Explain Doppler effect in light.

→ Doppler effect in light: 

When a light emitting source (like sun, stars, moon) is approaching or receding away from the observer then frequency or wavelength of light appears to be changing by the observer. This change in frequency or wavelength of light is known as Doppler effect of light.

The apparent frequency of light increases when distance between observer and source of light is decreasing and vice versa.

2. Distinguish between red shift and blue shift.

→ When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer. If an object moves closer, the light moves to the blue end of the spectrum, as its wavelengths get shorter.

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