# An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency

Question:

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. $12.1 \mathrm{GHz}$

Correct Option: 1

Solution: