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Q.

When an ideas gas (γ = 7/3) is heated under constant pressure, then what percentage of given heat energy will be utilised is doing external work

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a

43 %

b

57 %

c

29 %

d

40 %

answer is B.

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Detailed Solution

ΔQ=ΔU+ΔW   ⇒  ΔWΔQ=1−ΔUΔQ   ⇒  ΔWΔQ=1−nCVΔTnCPΔT=1−37  = 47  ≈  0.57
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