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Q.

A rocket is going away from the earth at a speed of 106 m/s.If the wavelength of the light wave emitted by it be5700 A, what will be its Doppler's shift

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a

,200Å

b

19Å

c

20Å

d

0⋅2Å

answer is B.

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Detailed Solution

Δλ=λVs/c =5700×106/3×108=19Å
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