First slide

Thermodynamic processes

Question

In adiabatic expansion

Moderate

A

$ΔU = 0$
B

$ΔU = negative$
C

$ΔU = positive$
D

$ΔW = zero$

Solution

In case of adiabatic expansion $ΔW$ = positive and $ΔQ = 0$
from FLOT $ΔQ = ΔU + ΔW \Rightarrow ΔU = - ΔW$ i.e., $ΔU$ will be negative.

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