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An observer is moving with half the spee...

An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What by theobserver ? ( Speed of light `=3xx10^8 ms^(-1)`)

A

17.3 GHz

B

15.3 GHz

C

10.1 GHz

D

12.1 GHz

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The correct Answer is:
A
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