The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is - 20°C, the temperature of the surroundings to which it rejects heat is:
41°C
11°C
21°C
31°C
As we learnt in
Coefficient of performance (beta) -
- wherein
For a perfect refrigerator
Coefficient of performance of a refrigerator is
B = 5
From equation (1)
or
or
Correct option is 4.
Option 1)
41°C
This option is incorrect.
Option 2)
11°C
This option is incorrect.
Option 3)
21°C
This option is incorrect.
Option 4)
31°C
This option is correct.