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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

`41^@C`

B

`11^@C`

C

`21^@C`

D

`31^@C`

Text Solution

Verified by Experts

The correct Answer is:
D
`beta=(T_2)/(T_1-T_2) implies 5=(-20+273)/(T_1-(-20+273))`
`implies 5T_1-5xx253=253`
`implies T_1=6/5 xx253=30.6^@C=31^@C`
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