Heat and Thermal ExpansionHard

Question

1023 molecules of a  gas strike a target of area 1 m2 at angle 45o to normal and  rebound elastically with speed 1 kms-1. The impulse normal to wall per molecule is :- [Given : mas of molecule = 3.32 × 10-27 kg]

Options

A.4.7 × 10-24 kg  ms-1
B.7.4 × 10-24 kg ms-1
C.3.32 × 10-24 kg ms-1
D.2.23 kg ms-1

Solution


Change in momentum
= 2mv cos(45o)
= 2 × 3.32 × 10-27×  103 ×
= 4.7 10-24 kg ms-1.

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