For a step potential function, assume that the potential barrier at x = 0 is twice as large as the total energy of an incident electron, whose velocity is 1 m/s at x < 0. the mass of electron is 9.11×10-31 kg. (a). calculate the probability of finding the electron at a distance d compared with x = 0, where d is 10-10 m into the potential barrier. (b). calculate the penetration depth of the electron impinging on the potential