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A star in the solar system gives of light with a frequency of 8.5×1014 Hz. If...

A star in the solar system gives of light with a frequency of 8.5×1014 Hz. If the star approaches Earth with a speed of 170.0 km/s, what is the frequency of the light seen by someone on earth?

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Answer #1

Solution:

the frequency of the light seen by someone on earth  

   where c = speed of light = 3*10 ^8 m/s ; = speed of the star = 170.0 km/s = 170*10^3 m/s ; and = frequency of light emitted by the star = 8.5×10^14 Hz

so

so ,the frequency of the light seen by someone on earth is

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