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Two identical vessels A & B contain equal amount of ideal monoatomic gas. The piston of A is fixed but that of B is free. Same amount of heat is absorbed by A & B. If B's internal energy increases by 100 J the change in internal energy of A is

  1. 100 J    
  2. fraction numerator 500 over denominator 3 end fraction J    
  3. 250 J    
  4. none of these    

The correct answer is: fraction numerator 500 over denominator 3 end fraction J

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