A parallel beam of nitrogen molecules moving with velocity `v = 400 m s^(-1)` imprings on a wall at an angle `theta = 30^(@)` to its normal. The concentration of molecules in the beam is `n = 9 xx 10^(18) cm^(-3)`. Find the pressure exerted by the beam on the wall, assuming that collisions are perfectly elastic.

Explanation

`p = (nv xx 2 mv cos theta cc dA cos theta)/(dA)`
=`2 m n v^2 cos^2 theta`.
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