A star, which is emitting radiation at a wavelength of 50000A , is approaching the earth with a velocity of 1.5×105m/s . The change in the wavelength of the radiation as received on the earth is
A
250A
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B
1000A
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C
Zero
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D
2.50A
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Solution
The correct option is D250A λ0=√1+β1−βλs
λ0 is observed wave length. λ is emitted wave length and