An observer is moving with half the speed of light towards a stationary microwave source emittin...

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An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency \( 10 \mathrm{GHz} \). What is the frequency of the microwave measured by the observer? (speed of light \( =3 \times 10^{8} \mathrm{~ms}^{-1} \) )
(1) \( 17.3 \mathrm{GHz} \)
(2) \( 15.3 \mathrm{GHz} \)
(3) \( 10.1 \mathrm{GHz} \)
(4) \( 12.1 \mathrm{GHz} \)
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