Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m.The average molecular energies are the same if the ratio of the temperatures T_A/T_B is: A)1/4 B)1/2 C)1 D)2 E)4

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For ideal monatomic gases, the average molecular energy is directly proportional to the temperature (E = 3/2 kT, where k is the Boltzmann constant and T is the temperature). Since the average molecular energies of gases A and B are the same, their temperatures must also be the same, making the ratio 1.

Ideal Monatomic Gas a Is Composed of Molecules with Mass