# Homework Help: Compton Shift and energy of scattered x-rays

1. Dec 16, 2012

### Gurj

X-rays with a wavelength of 0.2x10^-9 m collide with a target.
The scattered X-rays experience a Compton shift of 0.0007x10^-9 m.
What is the energy of the scattered X-rays?

Just wondering what equations I would use here etc?

Any help would be much appreciated, thanks.

Last edited: Dec 16, 2012
2. Dec 16, 2012

### Staff: Mentor

Can you determine the wavelength of the scattered X-rays?
Do you know how wavelength and energy of a photon are related?

I think there is a minus sign missing in your exponents.

3. Dec 16, 2012

### Gurj

Yeah sorry there was meant to be minus signs in there,
E=hc/lambda is the relationship between the energy and wavelength i think.
I know of this formula: λo=λ' - (h/Mo*c)*(1-cosθ) but then i dont know what exactly to do with it

4. Dec 16, 2012

### Staff: Mentor

You don't need that second formula, as the wavelength shift is given.

If the initial wavelength of 0.2 * 10^(-9) m increases by 0.0007 * 10^(-9) m, what is the new wavelength?

Your formula for the energy is right.

5. Dec 16, 2012

### Gurj

So I just add the wavelengths and plug that into the energy formula with the other two constants?

6. Dec 16, 2012

### Staff: Mentor

That will give you the correct answer, right.