Internal energy and pressure of a gas of unit volume are related as:

P = \frac{2}{3} U

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P = \frac{3}{2} U

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P = \frac{1}{2} U

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P = 2 U

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Solution

The correct option is A $P = \frac{2}{3} U$
$P \times 1 = R T$
Also, internal energy $U = \frac{3}{2} R T$
$∴ U = \frac{3}{2} P$ or $P = \frac{2}{3} U$

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Internal energy and pressure for unit volume of gas are related by

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