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Two cylinders \( A \) and \( B \) fitted with pistons contain equal amounts of an ideal diatomic gas at \( 300 \mathrm{~K} \). The piston of \( A \) is free to move while that of \( B \) is held fixed. The same amount of heat is given to the gas in each cylinder. If the
\( \mathrm{P} \) rise in temperature of the gas in \( A \) is \( 30 K \), then the rise in temperature of the gas in \( B \) is
[IIT 1998; Similar EAMCET 2009]
(a) \( 30 \mathrm{~K} \)
(b) \( 18 \mathrm{~K} \)
(c) \( 50 \mathrm{~K} \)
(d) \( 42 \mathrm{~K} \)
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