First slide

First law of thermo dynamics

Question

The relation between $∆ U$ and W during an adiabatic change in an Ideal gas

Easy

A

$∆ U = W$
B

$∆ U = q$
C

$∆ U = q + W$
D

$∆ U = 0$

Solution

According to first law of Thermodynamics, $∆ U = q + W$
During adiabatic change, no heat is absorbed by the system from the surroundings but Work is done on the system.
Hence $∆ U = W$ (work of compression)

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