# De Broglie Wavelengths

1. Sep 8, 2009

### Epif

1. The problem statement, all variables and given/known data
What is the de Broglie wavelength of a 10 microKelvin Rb atom? A 5000K electron?

2. Relevant equations
$$\lambda=\frac{h}{p}$$
V=$$\sqrt{\frac{3KT}{m}}$$

3. The attempt at a solution
I used the velocity equation to find the velocity relating to temperature and mass. Then, as p=mv, I calculated the wavelength of the Rb atom to be 86.4nm. I just want to make sure my line of thinking is correct and that I can use a similar process for the electron.

Thanks!

2. Sep 8, 2009

### CaptainEvil

Sounds good to me, just be careful if you're thinking about using that method for photons - you will go wrong!