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The cofficient of performance of a refri...

The cofficient 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 :

A

`21^@C`

B

`31^@C`

C

`41^@C`

D

`11^@C`

Text Solution

Verified by Experts

The correct Answer is:
B
Coefficient of performance of refrigerator
`C.O.P. =(T_(L))/(T_(H)-T_(L))`
where `T_(L) to` lower Temperature
`and T_(H) to` Higher Temperature
So, `5=(T_(L))/(T_(H)-T_(L))`
`T_(H)=6/5 T_(L)=6/5 (253)=303.6k`
`=303.6 -273=30.6^@C`
`=31^@C`
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