Two parallel plates separated by distance of 1cm have a potential difference of 20V between them. The plates are held in a horizontal position with the negative plate above the positive plate. An electron is released from rest in the upper plate. a) What is the acceleration of the electron?

b) How long it takes to reach the lower plate?

c) What is the kinetic energy of the electron when it hits the lower plate?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?