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10^(22) particles each of mass 10^(-26)...

`10^(22) ` particles each of mass `10^(-26) Kg` are striking perpendicular on a wall of area `1 m^(2)` with speed `10^(4)m//s` in `1 sec`. The pressure on the well if collision are perfectly elastic is : (A) `2 N//m^(2)` (B) `4N//m^(2)` (C) `6N//m^(2)` (D) `8 N//m^(2)`

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