If the doors of a refrigerator are left open for few hours, then the room temperature will
- Adecrease
- Bincrease
- Cremain the same
- Ddecrease only in the area in the vicinity of the refrigerator
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (b) increase
Explanation
A refrigerator is a heat pump that pumps heat from inside and exhausts it into the room via the condenser.
By the second law of thermodynamics, it dumps more heat into the room than it removes, since it also adds the work done by the compressor.
With the door open, this net heat is released into the same room, so the room temperature increases.