# Homework Help: Compton and X Ray

1. Oct 28, 2008

### getcarter

3) X-rays of wavelentgh 0.010nm are directed onto a target containing loosely bound electrons. For Compton scattering from one of those electrons, at an angle of 180 degrees, what are

a) the Compton shift,

b) the corresponding change in photon energy,

c) the kinetic energy of the recoiling electron, and

d) the electron's direction of motion?

2. Relevant equations

Lamda'-Lamda = [h/mc] (1-cos@)
\frac{h}{m_e c} = 2.43 \times 10^{-12}\,m

3. The attempt at a solution
p_{e'}^2c^2 = (hf + mc^2-hf')^2-m^2c^4

2. Oct 28, 2008

### olgranpappy

in your equation, for scattering at 180 degrees, what is "cos@" equal to?

3. Oct 29, 2008

### getcarter

relevants are above, i did not understand that you ask cos@,
sorry i don't understand the main idea of the question
and i need help.

4. Oct 29, 2008

### olgranpappy

I am asking you this to determine whether or not you understand what the symbols in the equation are.
You wrote down something that says "cos@". Do you know what the symbol @ stands for?

5. Oct 30, 2008

### getcarter

i tried to show tetha, [degree of cos.]
sorry.

6. Oct 30, 2008

### olgranpappy

Yes. And in the statement of the problem, what number is theta equal to?