First slide

Heat ;work and internal energy

Question

Work done by air when it expands from 100 litres to 200 litres at a constant pressure of 2 atmosphere is

Moderate

A

$2 \times 10^{5} J$
B

$2 \times 10^{4} J$
C

$2.5 \times 10^{4} J$
D

$2.5 \times 10^{5} J$

Solution

$\begin{array}{l} W = P Δ U \\ W = 2 \times 10^{5} [200 - 100] \times 10^{- 3} \\ W = 2 \times 10^{4} J \end{array}$

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