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Question

A monoatomic ideal gas is contained in a rigid container of volume V with walls of total surface area A, thickness x and thermal conductivity K. The gas is at an initial temperature To and pressure Po. The temperature of the surrounding air is T. All the temperatures are in absolute scale. If the temperature of the gas at any time t can be expressed as T(t)=Ts(TsTo)eλt, find the pressure of the gas at the steady state condition.

A
P=Po
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B
P=2Po
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C
P=PoToTs
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D
None of the above
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Solution

The correct option is C P=PoToTs
As the process is isochoric, PoTo=P(t)T(t)
[fixed volume of container]
T(t)=Ts(TsTo)eλt
P(t)=PoTo[Ts(TsTo)eλt]
At steady state, as t, second term goes to zero.
P=PoToTs

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