# Urgent Help Wikipedia Is Confusing On Compton Derivation

1. Feb 1, 2010

### aliz_khanz

I am confused in a thing that is on wikipedia and need to know ur answers on this.This is from the last part of derivation for comton shift.

From the RHS, you take the square of hf so it becomes h^2 f^2 + h^2f ' ^2 +2h^2ff 'cos theta

now how can it take the common from the below equation? if it has to take common , it implies that when u r squaring hf , u only square h not f (whereas i think that frequency should also be squarred) am i missing something?

Last edited by a moderator: Apr 24, 2017
2. Feb 2, 2010

### torquil

I think this is just a matter of doing the algebra. If this is homework (?) it should be in the homework-section.

Torquil