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## Homework Statement

Calculate the wavelength of a photon having the same momentum as an electron

moving at 1.0 106 m/s.

The answer is supposed to be 0.73 nm.

## Homework Equations

Ek = (m*v^2)/2

Ek = hf - W

p = E/c = hf/c = h/[tex]\lambda[/tex]

## The Attempt at a Solution

I first found Ek using the kinetic energy formula, using the speed of the electron given in the question and the mass of the electron.

I can't quite figure out where to go next.