18.) Consider electrons incident on a double slit apparatus. You observe that they form the same pattern as 450-nm light on the screen behind the slits.

a.) Calculate the velocity, in meters per second, of the electrons. v = ?

b.) Calculate the energy, in joules, of the a photon with this wavelength. KE_p = ?

c.) Calculate the kinetic energy, in joules, of the electron. KE_e =?

d.) How many times greater is the energy of the photon than the electron?
KEp/KEe =?