Calculate the probability that an electron in the ground state of an
hydrogen atom could be in a greater distance from the proton than its
energy would allow according to classical theory.

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

What does every magnet possess? a. iron metal b. strong magnetic field c. repulsion d. north and south poles

Which of the following is tru about semi-conductors