posted by beth .
It takes 208.4 kJ of energy to remove 1 mole of electrons from atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom ont eh surface of solid rubidum? What is the maximum wavelength of light capable of doing this?
If 208.4 kJ of energy will remove 6.023 x 10^23 electrons, how many kJ will we need to remove just one electrons?
Then E = hc/lambda. You know E, h is Planck's constant, c is the speed of light in m/s, and lambda is the waveldngth in meters.