Question

Work done by air when it expands from $50$ litres to $150$ litres at a constant pressure of $2$ atmosphere is

• A. $2\times {10}^4$ joules
• B. $2\times 100$ joules
• C. $2\times {10}^5\times 100$ joules
• D. $2\times {10}^6\times 100$ joules

Answer 1

The correct option is A $2\times {10}^4$ joules

$W=P\Delta V=2\times (150-50)=2\times 100=200litreatm=200\times 101.33J\approx 2\times {10}^{4}J$