Q126 / 180 · KCET 2020 · Physics

In an adiabatic expansion of an ideal gas the product of pressure and volume

Correct answer
A
decreases
B
increases
C
remains constant
D
at first increases and then decreases

Solution

In an adiabatic expansion, internal energy decreases and hence temperature also decreases. Hence, from ideal gas equation, $p V=n R T$ Since, $T$ decreases. Hence, $p V$ also decreases.

Hence, the correct answer is option: 'A'.

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