00:01
So here in this question, the formula for doppler shift is the observed wavelength that is lambda is equals to lambda naught into square root of 1 plus v by c upon 1 minus v by c.
00:24
C.
00:25
Now, here lambda naught is the rest wavelength, v is the velocity.
00:31
Now, we separate calculation for forward and backward beams.
00:35
For forward beam, the source that is hydrogen atom is moving forward or towards the observer.
00:42
In this case, the velocity is positive and let us say this is the observer and the source that is hydrogen atom is moving towards it.
00:52
So, the velocity is positive and and if the hydrogen atom is moving backwards, in this case, the velocity is negative.
01:02
Now, we need to calculate lambda for both cases...