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Q.

When an ideal gas undergoes an isothermal expansion, the pressure of the gas decreases due to

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a

both decrease in frequency of collision and change in momentum per collision

b

none of these

c

decrease in change in momentum per collision

d

decrease in frequency of collision with the container

answer is B.

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Detailed Solution

Since number density of molecules decreases , number of collisions with the walls also decreases. Presure is proportional to the number of collisions per unit time with the walls of the container.

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When an ideal gas undergoes an isothermal expansion, the pressure of the gas decreases due to