04:00
University Physics with Modern Physics
(a) What is the smallest amount of energy in electron volts that must be given to a hydrogen atom initially in its ground level so that it can emit the H$_\alpha$ line in the Balmer series? (b) How many different possibilities of spectral-line emissions are there for this atom when the electron starts in the $n$ = 3 level and eventually ends up in the ground level? Calculate the wavelength of the emitted photon in each case.