Compton effect photo scatterred

[negation]

Homework Statement

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)

The Attempt at a Solution

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

29pm = 29x10^-11m

E_i = E_f + KE

E_i - E_f = ΔE = h(c/Δλ)

I set Θ = 180 and worked out

λ_f = (h/m_ec)(1-cosΘ) + λ_i =
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.

 

[negation]

Homework Statement

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)

The Attempt at a Solution

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

29pm = 29x10^-11m

E_i = E_f + KE

E_i - E_f = ΔE = h(c/Δλ)

I set Θ = 180 and worked out

λ_f = (h/m_ec)(1-cosΘ) + λ_i =
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.

Edit: I have it now.

 

[bababong]

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

 

[bababong]

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

Edit: I got it.