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An ideal gas is in thermodynamic equilibrium. The number of degrees of freedom of a molecule of the gas is n. The internal energy of one mole of the gas is U n and the speed of sound in the gas is v n . At a fixed temperature and pressure, which of the following is the correct option?

1. v 3 < v 6 and U 3 > U 6
2. v 5 > v 3 and U 3 > U 5
3. v 5 > v 7 and U 5 < U 7
4. v 6 < v 7 and U 6 < U 7

Correct answer: v 5 > v 7 and U 5 < U 7

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