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$2 \times {10^{ - 5}} \times 100$ joules
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