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    				| 1. | The mass of hydrogen molecule is `3.32xx10^(-27)` kg. If `10^(23)` hydrogen molecules strick per second at 2 `cm^(2)` area of a rigid wall at an angle of `45^(@)` from the normal and rebound back with a speed of 1000 `ms^(-1)`, then the pressure ezxeted on the wass is A. `2.34xx10^(3)` PaB. `0.23xx10^(6)`PaC. `0.23xx10^(3)`PaD. `23.4xx10^(3)`Pa | 
| Answer» Correct Answer - A `F=(Deltap)/(Deltat)=(nm)(2vcos theta)` Pressure, `p=F/A=((nm)(2vcos theta))/A` `" "=(10^(23)xx3.32xx10^(-27)xx2xx100xxcos45^(@))/(2xx10^(-4))` `" "=2.34xx10^(3)Nm^(-2)` | |