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**1. Homework Statement**

**2. Homework Equations**

de Broglie wavelength λ = h/p

E^2 = p^2 c^2 + (m0)^2 c^4

L-compton = (h-bar) / mc

**3. The Attempt at a Solution**

I'm trying to work out the wavelength of an electron with a kinetic energy of 1keV

So I intend on using

de Broglie wavelength λ = h/p

and

Relativistic mass equation

E^2 = p^2 c^2 + (m0)^2 c^4

then inputting the rest mass energy of an electron (511 keV) into the formula above. Though do I need to convert this first to kg?

Also, I'd still be left with two unknowns in mass eqn i.e. E and p, so how do I obtain the value for E?

Or should I instead be using the Compton wavelength formula i.e.

L-compton = (h-bar) / mc

The question just asks for the wavelength.