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Q.

A star emitting light of wavelength 5896Å is moving away from the earth with a speed of 3600 km/s. The wavelength of light observed on earth will

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a

 decrease by 5825.25Å

b

 increase by 5966.75Å

c

 increase by 70.75Å

d

 decrease by 70.75Å

answer is D.

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Detailed Solution

Δλ=vcλ=3600×1033×108×5896=70.75Å

So the increased wavelength of light is observed.

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A star emitting light of wavelength 5896Å is moving away from the earth with a speed of 3600 km/s. The wavelength of light observed on earth will