A container holds 2 × 1 0 25 molecules per m 3 , each of mass 5 × 1 0 − 26 kg. One-quarter of them move at 400 m s − 1 straight towards a wall and the rest move away or parallel to it. All collisions

Question

A container holds 2 × 1 0 25 molecules per m 3 , each of mass 5 × 1 0 − 26 kg. One-quarter of them move at 400 m s − 1 straight towards a wall and the rest move away or parallel to it. All collisions with the wall are elastic. Which statements are correct?

TestHub · Accepted Answer

Rate = 4 n ​ v = 4 2 × 1 0 25 ​ × 400 = 2 × 1 0 27 per m 2 per s (A). Each hit gives 2 m v = 4 × 1 0 − 23 N s, so P = 4 × 1 0 − 23 × 2 × 1 0 27 = 8 × 1 0 4 N m − 2 (C). A and C.

Physics - Heat & Thermo Question with Solution | TestHub

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