# Homework Help: De – Broglie wavelength of O_2

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1. Dec 26, 2017

### Pushoam

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

2. Relevant equations

3. The attempt at a solution

De – Broglie wavelength of $O_2$ molecule is $\lambda = \frac h p$

Assuming that the speed of molecule is small enough to take non – relativistic calculation,

$\frac { p^2}{2m} = \frac { 3 k_B T }2$

$\lambda = 2.6 * 10^{-11}~ m$

So, the correct option is (a).

2. Dec 26, 2017

### kuruman

Looks right.

3. Dec 26, 2017

Thanks.