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Chapter 2: Q56E (page 541)

How fast (as a percentage of light speed) would a star have to be moving so that the frequency of the light we receive from it is 10.0% higher than the frequency of the light it is emitting? Would it be moving away from us or toward us? (Assume it is moving either directly away from us or directly toward us.)

Short Answer

Expert verified

(v=0.095c) the star must be moving toward us because the frequency received from it is greater than the frequency emitted by it.

Step by step solution

01

Step 1:

If the frequency of the star's light is fs, then the frequency of the light received from that star will be 1.1fs. The relationship that describes the frequency of the received light is:

fr=fSc+vc-v

Replacing frwith 1.1fs;

1.1fs=fsc+Vc-v1.1fs=c+Vc-v

02

Step 2:

On putting the value;

1.12=c+Vc-vc+V=1.12c-1.12vv+1.12v=1.12c-cv=1.12-11.12+1c

So, the value is

v=1.12-11.12+1cv=0.0095c

Hence, the star must be moving toward us because the frequency received from it is greater than the frequency emitted by it.

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