Two cylinder A and B fitted with pistons...

Two cylinder A and B fitted with pistons contain equal number of moles of an ideal monoatomic gas at 400 K . The piston of A is free to move while that of B is held fixed . Same amount of heat energy is given to the gas in each cylinder . If the rise in temperature of the gas in A is 42 K, the rise in temperature of the gas in B is

21 K

35 K

42 K

70 K

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