Question

If the root mean square velocity of the particles in a gas is
450 m/s, and a particle collides with another particle every 2.0 ×
10^{-9} seconds on average, then the mean free path is.

a. 6.0x10^-7 m.

b. 7.5x10^-7 m.

c.6.9x10^-7 m.

d. 9.0x10^-7m.

e. 85x10^-7 m.

Answer #1

Mean free path is the distance travelled by the particle before the collision .

Given, the collision time is 2.0 x 10^{-9} s.

And the rms velocity of the gas-particle is 450 m/s.

So, the mean free path of the gas-particle is

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