Q. During an isothermal expansion, a confined ideal gas does $- 150J$ of work against its surrounding. This implies that
A) $150\ J$ of heat has been added to the gas
B) $150\ J$ of heat has been removed from the gas
C) $300\ J$ of heat has been added to the gas
D) No heat is transferred because the process is isothermal
Explanation
(b) $\mathrm{\Delta}Q = \mathrm{\Delta}U + \mathrm{\Delta}W$
$\mathrm{\Delta}Q = 0 - 150\ J$
So, heat has been given by the system
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.