Planck's oscillators and the energy assumption

by Saketh
Tags: assumption, energy, oscillators, planck
 P: 262 First of all, why is $$E = h\nu$$? Second, where can I find the derivation behind Planck's "oscillators in a box" calculations that led to the assumption that energy is quantized? I realize that my questions are a bit vague, but I cannot make them more specific as I do not have a firm grasp of the subject.