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## Homework Statement

A photon carrying energy of 40keV scatters from an electron initially at rest. what is the maximum energy the electron can have?

## Homework Equations

## The Attempt at a Solution

I tried using conservation of energy

Initial: 40keV (energy of photon) + mc^2 (rest energy of electron)

Final: To have the most energy all the energy of the photon should be transfer to kinetic energy of the electron correct?

so wouldn't the final energy just be the rest energy of the electron + the kinetic energy of the electron? Not sure where im missing an idea..thanks for the help