a star is moving away from earth with speed V.The change in wavelength observed on earth is?
Shantha Meera.S , 11 Years ago
Grade 12
Modern Physics> a star is moving away from earth with spe...
1 AnswersAarti Gupta
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)
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
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