When an ideal gas under goes an isothermal expansion, the

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When an ideal gas under goes an isothermal expansion, the pressure of the gas in the enclosure falls. This is due to

1. Decreased in the change of momentum per collision
2. Decrease in the frequency of collision
3. Decrease in the frequency of collision and the change of momentum per collision
4. Decrease in neither the frequency of collision nor the change of momentum per collision

Correct Option: B

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