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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 is the frequency of the microwave measured by the observer? (speed of light = ` 3xx 10^(8) m cdot s^(-1)` )

A

10.1 GHz

B

12.1 GHz

C

17.3 GHz

D

15.3 GHz

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