- #1
Mppl
- 13
- 0
I'm having a course about introduction to quantum mechanics and I am having a lot of problems understanding the derivation of the Rayleigh-Jeans Law which was an attempt to explain the black body radiantion expectrum with classical arguments.
My main problem is:
they assumed that matter was made of vibrating charges, and because they were vibrating they produced electromagnetical radiation till now no problems.
they they said, well if we know the mean value of the energy of each of these particles and we know the number of charges that vibrate with f between f and f+df we know the energy emited between those frequencies, well I can leave with that, but then they make the assumption that somehow the number of charges that vibrate between those 2 frequencies (and assuming that the black body is cubic a box with a small hole in it) is given by the number of stacionary waves that have frequencies between the 2 values I mentionated devided by the box volume...how can it be? I am certainly missing a step here...can someone explaining it to me?
My main problem is:
they assumed that matter was made of vibrating charges, and because they were vibrating they produced electromagnetical radiation till now no problems.
they they said, well if we know the mean value of the energy of each of these particles and we know the number of charges that vibrate with f between f and f+df we know the energy emited between those frequencies, well I can leave with that, but then they make the assumption that somehow the number of charges that vibrate between those 2 frequencies (and assuming that the black body is cubic a box with a small hole in it) is given by the number of stacionary waves that have frequencies between the 2 values I mentionated devided by the box volume...how can it be? I am certainly missing a step here...can someone explaining it to me?