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Question: The state of a thermodynamic system change from A to B adiabatically and in this process 500 J of wo...

The state of a thermodynamic system change from A to B adiabatically and in this process 500 J of work is done on the system. Now the state of same system is changed from A to B by means of another process and in this process 120 J of heat is supplied to system, then –

A

Temperature of system in state B is equal to that in state A.

B

In new process the work done by the system against the surrounding is +380 joule

C

The new process is same polytrophic process.

D

Temperature of system in state B is lesser than that in state A.

Answer

The new process is same polytrophic process.

Explanation

Solution

Q = 0, W = – 500

Q = DU + D W

0 = DU – 500

DU = 500 joule

system is taken from A to B and TB > TA as DV is positive

for new processes

Q1 = DU + W1

120 = 500 + W1

W1 = – 380 new process is not isobaric, isochoric and not isothermal. It would be polytrophic process.