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Q.

If the shift in a star light is towards red end, then

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a

the star is approaching the earth with constant velocity

b

the star receding from the earth

c

the apparent frequency is more than actual

d

the star is approaching the earth with variable velocity

answer is B.

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Detailed Solution

When the shift in star light is towards red end, wavelength increases and the apparent frequency is less than the actual. The star must be receding away from the earth.

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If the shift in a star light is towards red end, then