Question

all microscope particles, whether mass less, like photons, or having mass like electrons, have properties. the relationship between momentum and wavelength is fundamental for all particles

Answer 1

For Part 1, since the de Broglie wavelength is given, the electron’s velocity can be obtained from λ=hpλ=hp by using the nonrelativistic formula for momentum, p = mv.

For Part 2, once v is obtained (and it has been verified that v is nonrelativistic), the classical kinetic energy is simply 12mv2