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Question

When an ideal diatomic gas is heated at constant pressure then what fraction of heat given is used to increase internal energy of gas ?

A
25
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B
35
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C
37
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D
57
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Solution

The correct option is D 57
For a diatomic gas we have the degree of freedom as 5.
Thus heat given at constant pressure is given as nCpΔT=n(1+52)RΔT=n72RΔT.
The heat given to change the internal energy is nCvΔT=n52RΔT.
The fraction of internal energy thus used is 57

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