PART -A (PHYSICS)
If 
gas molecules each of mass 
collide with a surface (perpendicular to it) elastically per second over an area 
with a speed 
, the pressure exerted by the gas molecules will be of the order of:
Text Solution
Verified by ExpertsB
Pressure is defined as normal force per unit area.
Force is calculated as change in momentum/ time.
By this answer is 
None of the option matches so this question must be
Bonus.
Detailed solution is as following:
Magnitude of change in momentum per collision 
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