# Homework Help: Equipartition ceasing to apply at what temperature?

1. Apr 19, 2017

1. The problem statement, all variables and given/known data

A tuning fork has a frequency of 440 Hz.

A) What is the size of one quantum of energy of vibration?
B) To approximately what temperature would the fork have to be cooled before equipartition would cease to apply to its thermal motions?

2. Relevant equations

3. The attempt at a solution

A) 440 * h (Plank's constant)

B) ?? How does equipartition cease to apply?

2. Apr 20, 2017

### patzer234

You have the first part correct i.e. $E=hf$ (read about the photoelectric effect for more details on where this comes from).
For the second part what do you think happens when the temperature is reduced? Does quantum physics have any role to play in this? Do you know any quantum physics equations which describe energy? Also do you know any formulae that relate to equipartition and have energy and temperature as variables?