First slide
First law of thermodynamics

The volume (V) of a monatomic gas varies with its temperature (T) as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is


Given process is isobaric.

  dQ=nCpdT; where Cp is specific heat at constant pressure.

 or   dQ=n52RdT

 Also, dW=PdV=nRdT Required ratio =dWdQ=nRdTn52RdT=25

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