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Grade: 12

                        

a star is moving away from earth with speed V.The change in wavelength observed on earth is?

6 years ago

Answers : (1)

Aarti Gupta
askIITians Faculty
300 Points
							If the star is moving away from us, its waves are effectively stretched 
out when they reach Earth, increasing their wavelength. This shifts the 
star's spectral lines toward the red end of the spectrum.
In 1 second there are f waves and these will cover a distance of v + c where c is the speed of light. (Speed = distance/time and time = 1 second)

The apparent wavelength observed on earth in line with the motion is ?a and is given by

?a = (v + c)/f but f = c/? so ?a = (v + c) ? /c = (v/c + 1) ?

so

?a - ? = v? /c differences in wavelength can be written as ?? so (?a - ? = ??) so ?? = v?/c

Thanks & Regards

Aarti gupta

askiitians Faculty








6 years ago
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