A free electron at rest causes an xray photon with a wavelength of 0.240 nm to scatter. With respect to the direction of the input photon, the scattered photon rotates at an angle of 125 degrees. Find the a) initial momentum and b) final momentum.

Modern Physics
3rd Edition
ISBN:9781111794378
Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Chapter3: The Quantum Theroy Of Light
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A free electron at rest causes an xray photon with a wavelength of 0.240 nm to scatter. With respect to the direction of the input photon, the scattered photon rotates at an angle of 125 degrees. Find the a) initial momentum and b) final momentum.

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Given the wavelength of the x-ray photon λ=0.240nm=2.4×10-10m

scattering angle θ=125o

(a)  initial momentum of the photon will be pi=hλ=6.63×10-342.4×10-10=2.76×10-24kg-m/s

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