Question

The apparent wavelength of a light from a star
moving away from the earth is 0.02% more than
the actual wavelength.The velocity of the star is __ km/sec.​

Answer 1

Answer:

60 km/s.

Explanation:

The apparent change in the wavelength is given as follows.

λ

Δλ

=

C

v

,HenceV=

λ

Δλ

C

=

100

0.02

×3×10

8

ms

−1

=60kms

−1

.

Hence, the velocity of the star is 60 km/s.

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