Which one of the following is applicable for an adiabatic expansion of ideal gas?
A
ΔU=0
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B
W=ΔU
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C
W=−ΔU
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D
W=0
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Solution
The correct option is DW=−ΔU Since, in any adiabatic process the amount of heat lost or gain by any system is 0. Hence, q=0 According to 1st law of thermodynamics, q=ΔU+W Hence, 0=ΔU+W => W=−ΔU Hence, answer is option C.