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For two gases, \( A \) and \( B \) with molecular weights \( \mathrm{M}_{\mathrm{A}} \) and \( \mathrm{M}_{\mathrm{B}} \), it is observed that at a certain temperature \( T \), the mean velocity of \( A \) is equal to the \( V_{r m s} \) of \( B \). Thus the mean velocity of \( A \) can be made equal to the mean velocity of \( B \), if
(a) \( \mathrm{A} \) is at temperature \( \mathrm{T} \) and \( \mathrm{B} \) at \( \mathrm{T}^{\prime} \) such that \( \mathrm{T}\mathrm{T}^{\prime} \).
(b) Temperature of \( \mathrm{A} \) is lowered to \( \mathrm{T}_{2} \) while \( \mathrm{B} \) is at \( \mathrm{T} \) such that \( \mathrm{T}_{2}\mathrm{T} \).
(c) Both \( \mathrm{A} \) and \( \mathrm{B} \) are raised to a higher temperature.
(d) Heat energy is supplied to A.
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