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The mass of a hydrogen molecule is 3.32 × 10 –27 kg. If 10 23 hydrogen molecules strike, per second, a fixed wall of area 2 cm 2 at an angle of 45° to the normal, and rebound elastically with a speed of 10 3 m/s, then the pressure on the wall is nearly :

1. 2.35 × 10 3 N/m 2
2. 4.70 × 10 3 N/m 2
3. 2.35 × 10 2 N/m 2
4. 4.70 × 10 2 N/m 2 Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : K.T.G, Exercise # 1, Q.No.21 ]

Correct answer: 2.35 × 10 3 N/m 2

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