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Due to Doppler effect, the shift in wave...

Due to Doppler effect, the shift in wavelength observed is `0.1 Å, for a star producing a wavelength 6000 Å. The velocity of recession of the star will be

A

20 km `cdot s^(-1)`

B

`2.5` km `cdot s^(-1)`

C

10 km `cdot s^(-1)`

D

5 km `cdot s^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Doppler shift, `Delta lambda = lambda v/c`
`therefore v=c(Delta lambda)/ lambda = (3xx 10^(8))xx0.1/6000`
`=5 xx 10^(3) m//s = 5 `km/s
The option (D) is correct.
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