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Question

Figure shows graphs of pressure vs density for an ideal gas at two temperatures T1 and T2.
(a) T1 > T2
(b) T1 = T2
(c) T1 < T2
(d) Any of the three is possible.

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Solution


The straight line T1 has greater slope than T​2. This means Pρ ratio is greater for T1 than T2. Now, rms velocity of a gas is given by 3Pρ. This means rms velocity of gas with T1 molecules is greater than T2 molecules. Again, gas with higher temperature has higher rms velocity.

So, T1 > T2.

Thus, (a) is the correct answer.

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