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BITSAT2014PhysicsThermodynamicsActual

In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 ~J of heat and 8 ~J of work is done on the gas. If the initial internal energy of the gas was 30 ~J , then the final internal energy will be

Options

  1. A2 ~J
  2. B42 ~J
  3. C18 ~J
  4. D58 ~J

Correct answer

C. 18 ~J

Step-by-step solution

Given Q =-20 ~J , ~W =-8 ~J Using Ist law Q = U + W array l Q=-20+8=-12 ~J Uf =-12+30=18 ~J array

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