1) What is the energy of a photon of light with a wavelenth of624 nm?
2) What wavelenth of light is emitted by an electron falling from the n=4 level of a hydrogen atom to the n= 2 level?
3) An electron in a hydrogen atom falls from a n=4 level to a lower level, emitting light with a wavelneth of 486 nm. What value of n was the lower level to which the electron fell?
4) What wavelenth of light is emitted by an electron on a hydrogen atom which drops from the n=5 level to the n=2 level?