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A star moves away from earth at speed 0....

A star moves away from earth at speed 0.8 c while emitting light of frequency `6 xx 10^(14)` Hz . What frequency will be observed on the earth (in units of `10^(14)` Hz) (c= speed of light)

A

`0.24`

B

`1.2`

C

30

D

`3.3`

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The correct Answer is:
B
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