# Doppler wavelength shift equation

1. Mar 3, 2008

### bse

Can anyone tell me what the doppler wavelength shift equation is?

thanks

2. Mar 3, 2008

3. Mar 3, 2008

### bse

I'm trying to find the wavelength shift for light with a certain wavelength that is emitted from the sun. Is there a different kind of equation for light wavelength shifts?

4. Mar 3, 2008

### Zhivago

There's the relativistic Doppler shift, $$\lambda= \lambda _0 \sqrt{ \frac{1+v}{1-v}}$$
But if you're only making the correction of the speed Earth to Sun, the classical formula is enough, I think

Last edited: Mar 3, 2008