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Question

The work done in adiabatic process is given by:

A
nR(T1T2)γ
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B
nR(T1T2)γ1
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C
nγ(T1T2) R
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D
γ(T1T2)n R
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Solution

The correct option is B nR(T1T2)γ1
Work done in adiabatic process:
ΔW=ΔU=nCv(T1T2)=P1V1P2V2(γ1)=nR(T1T2)γ1

work done by system is (+ve), if T1>T2 (hence expansion)
work done on the system is (ve) if T1<T2 (hence compression)

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