# Compton effect photo scatterred

1. May 28, 2014

### negation

1. The problem statement, all variables and given/known data

A photon of wavelength 29 pm is scattered by a stationary electron. What is the maximum possible energy loss of the photon?
(mass of electron = 9.11 × 10-31 kg, h = 6.626 × 10^-34 J · s, c = 3.00 × 10^8 m/s)

3. The attempt at a solution

After an hour or so, I'm not getting the right answer.

29pm = 29x10-11m

Ei = Ef + KE

Ei - Ef = ΔE = h(c/Δλ)

I set Θ = 180 and worked out

λf = (h/mec)(1-cosΘ) + λi =
4.854212x10-12m

ΔE = 6.626x10-34 (3x108/4.854212x10-12)
= 4.095x10-14 j

to convert to eV, i divided the above by 1.6 x10-16 but it doesn't give me the correct answer.

2. May 28, 2014

### negation

Edit: I have it now.

3. May 31, 2016

### bababong

Hi, could you post your step by step solution? I cannot seem to get the answer

4. May 31, 2016

### bababong

Edit: I got it.

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