# Planck's oscillators and the energy assumption

1. ### Saketh

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.

2. ### Dr Transport

1,503
Any introductory QM book should have the answer to the first question. The second question follows from the first and is found in texts on statistical physics.

3. ### Saketh

262
The problem is that the only book I have access to is "Introduction to the Quantum Theory" by David Park. The first question is not answered in this book.

As for the second question, I don't have access to statistical physics texts at all. Is there an explanation on the internet somewhere? (Is this a good one?)