# Homework Help: Number of collisions/sec for a gas atom

1. May 16, 2012

### ZedCar

1. The problem statement, all variables and given/known data
Consider a single ideal gas atom bouncing between two opposite faces of a cubic container, with sides of length l.
Using m for the mass of the gas atom and Vx (V sub x) for the velocity component, give an expression for the number of collisions per second the atom makes with one of the faces.

2. Relevant equations

3. The attempt at a solution

Number of collisions per second with one of the faces = (1/2)(l^2)(Vx)n

Where n is the number of gas atoms per unit volume.

Should n be in the solution?
If the number of atoms per unit volume, n, increases then according to the solution so do the number of collisions with one of the faces. Would that be correct? The higher the number of gas atoms per unit volume, the more collisions there are per second with one of the faces?

Thank you

2. May 16, 2012