Energy of the particle jet E=5 eV and it collides with a potential barrier whose height is U0=6 eV and thickness ℓ=0. 7 nm . It is assumed that a current of one ampere is transported electrically with the particle jet. How long, on average, does the experimenter have to wait for the first particle to completely penetrate the barrier, i. e. get to the other side through the barrier, when the particle jet is formed from:

a) electrons?

b)protons?