The Franck–Hertz experiment involved shooting electrons into a low-density gas of mercury atoms and observing discrete amounts of kinetic energy loss by the electrons. Suppose that instead a similar...

The Franck–Hertz experiment involved shooting electrons into a low-density gas of mercury atoms and observing discrete

amounts of kinetic energy loss by the electrons. Suppose that instead a similar experiment is done with a very cold gas of

atomic hydrogen, so that all of the hydrogen atoms are initially in the ground state. If the kinetic energy of an electron is

11.6 eV just before it collides with a hydrogen atom, how much kinetic energy will the electron have just after it collides

with and excites the hydrogen atom?