I need to figure out the energy, rest mass, speed, wavelength and momentum of a 2.2 eV electron. Thats all it says.
Ek = 1/2mv^2
The Attempt at a Solution
I dont understand what 2.2 eV is. The kinetic energy?
This converts to 3.52x10^-19 J
Rest mass should be 9.11x10^-31. Or do I use E=mc^2? Why or why not?
No idea how to find speed, which I need to calculate wavelength and momentum. I could use Ek= 1/2mv^2 because the electron will not be travelling close to the speed of light, but I feel like this is not the way you SHOULD calculate it. There has to be another way.