Optics Question 259

Question: 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 be $ 5700{AA} $ , what will be its Doppler’s shift

[RPMT 1996]

Options:

A) $ 200{AA} $

B) $ 19{AA} $

C) $ 20{AA} $

D) $ 0.2{AA} $

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Answer:

Correct Answer: B

Solution:

$ \frac{\Delta \lambda }{\lambda }=\frac{v}{c} $

Therefore $ \Delta \lambda =\frac{5700\times 10^{6}}{3\times 10^{3}}=19{AA} $



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