Q.

A gas is heated at a constant pressure. The fraction of heat supplied used for external work is

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a

1γ

b

1−1γ

c

γ−1

d

1−1γ2

answer is B.

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Detailed Solution

first law of thermodynamics is dQ = dU+dW---(1) dQ=nCPdT dU=nCVdT ;       CPCV=γ ⇒ CPγ=CV  substitute in eqn(1) nCPdT=nCPγdT+dW nCPdT(1-1γ)=dW dQ(1-1γ)=dW (1-1γ)=dWdQ=fraction of heat supplied used for external work
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A gas is heated at a constant pressure. The fraction of heat supplied used for external work is