How do you find relative velocity of an electromagnetic wave?
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Answer:
0.011c, rounded to three decimal places
where c=3×108ms−1
Explanation:
There is difference between the question heading and the main question.
We are required to find the relative velocity of the galaxy to the earth given is the frequency of the signal emitted by the source in the distant galaxy while observed on earth.
It is a question of application of Doppler effect as applicable to electromagnetic radiations.
We know from the postulate of Special Relativity that speed of light c is constant in vacuum and is independent of the speed of the source.
As such Doppler effect is observed in case of movement of source with respect to the observer as shown in the figure below which depicts Doppler redshift and blueshift.
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