Doppler's shift

[Relativista]

When the object is moving away will cause shifting.So you can compute its velocity from shifting,right? But why the objects those have the [emitted waveleght/rest waveleght] higher than 1 are faster than light? why? it's imposible!

[FraserClarke]

You need to use the relativistic form of the equation. The simple v/c = emitted/rest - 1 formula is a low speed approximation.

Look up "relativistic redshift".

[Theinvoker]

It's very closely related to the equation in your signature ...

[acey]

Lorentz transformation - Wikipedia, the free encyclopedia

Relativistic Doppler effect - Wikipedia, the free encyclopedia

[Relativista]

Oh.Thanks you.