10 22 gas molecules each of mass 10 -26 kg collide with a surface (perpendicular to it) elastically per second over an area 1 m 2 with a speed of 10 4 m s -1 . The pressure exerted by the gas molecules will be
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A
v= 10 4 ms -1
m = 10 -26 n - 10
22 A =1m
2
p = 2 mnv
p = 2 x 10 22 x 10 -26 x 10 4 = 2
P = 
= 2Nm -2
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