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  4. An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10GHz . What is the frequency of the microwave measured by the observer? (speed of light = 3× 108ms- 1 )

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Q. An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency $10GHz$ . What is the frequency of the microwave measured by the observer? (speed of light = $3\times 10^{8}ms^{- 1}$ )

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
$f_{app}=\left(1 + \frac{V}{C}\right)f=\left(1 + \frac{1}{2}\right)\times 10\left(GH\right)_{2}$
$\frac{3}{2}\times 10=15GH_{2}$