Question
calculate the wavelength of an electron of mass 9.1×10-31 kg moving with a velocity of 2.0×106 m/s. Plancks constant, h = 6.63 x 10-34Js.
Answer
Mass of electron, Me = 9.1×10-31 kg, v = 2.0×106 m/s, and h = 6.63 x 10-34Js.
From De Broglie, λ = h / (Mev) = (6.63 x 10-34) / (9.1×10-31 x 2.0×106) = 3.64×10-10 m
Therefore, the wavelength of the electron is 3.64×10-10 meters.