A photon has an energy E and wavelength lambda before scattering from a free electron. After scattering through a 140 angle, the photon's wavelength has increased by 11.0%.
Find the initial wavelength of the photon in pm.
Find the initial energy of the photon in fJ.
eduardomoo
Favorite Answer
This is a question about conserved quantities. Think about this:
1) For the photon + electron system, is momentum conserved before and after the collision?
2) For the photon + electron system, is energy conserved before and after the collision?
Hints: the electron is infinitely massive relative to the photon. Momentum p = h/lambda and kinetic energy = p^2/(2*m).
Anonymous
Hi,
A good link to download Photon is: http://bit.ly/1k3tPwW
I strongly recommend it.
Best