An ideal gas is subjected to an isothermal expansion such that its volume changes from $V_i$ to $V_f$ and pressure from $P_i$ to $P_f$. The work done on the gas is :
  • A$W = +nRT\,log\,\frac{V_f}{V_i}$
  • B$W = -nRT\,log\,\frac{V_f}{V_i}$
  • C$W = nRT\,log\,\frac{P_f}{P_i}$
  • D$W = -nRT\,log\,\frac{P_f}{P_i}$
AIIMS 2011, Easy
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