1. In a collection of hydrogen gas, 100 electrons are located in the n=3 orbit. A. What is the frequency of a photon that could have been absorbed to cause an electron to transition from its ground state to the n=3 orbit? Now, as these electrons return to their ground states, assume that every available transition is equally likely to happen (i.e. if there are two options, will take each option). B. How many different frequencies will be seen in the photons emitted as the electrons return to their ground state? C. What are the frequencies? D. How many photons of each frequency will be seen? I think I'm okay on part A, I got 2.9 x 10^15 Hz...but the rest I have no idea where to begin. A little help just on what approach to take?