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Can anyone help to answer this question(from Modern Physics)? Pls explain every derived equation, thanks! A...

Can anyone help to answer this question(from Modern Physics)? Pls explain every derived equation, thanks!

A photon has an initial wavelength of 2 nm and collides head-on with an electron, which is initially at rest. Following the collision, both the photon and electron move forward exactly along the x-axis. If the photon has a final wavelength of 8 nm, what is the electron’s final momentum in units of keV/c ?

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