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If 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 10 4 m/s, the pressure exerted by the gas molecules will be of the order of -

1. 10 8 N/m 2
2. 10 4 N/m 2
3. 10 16 N/m 2
4. 10 3 N/m 2

Correct answer: 10 3 N/m 2

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