Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoSecond Law of ThermodynamicsEasy2 minPYQ_2015

PhysicsEasysingle choice

The coefficient of performance of a refrigerator is $5$ . If the temperature inside the freezer is $- 20 ° C$ , the temperature of the surrounding to which it rejects heat is:NEET 2015 (Phase 2)

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Answer:

Solution:

Coefficient of Performance = $\frac{q_{2}}{w} = \frac{q_{2}}{q_{1} - q_{2}} = \frac{T_{c}}{T_{H} - T_{C}} = 5$

$T_{C} = 5 T_{H} - 5 T_{c}$

$6 T_{c} = 5 T_{H}$

$T_{H} = \frac{6}{5} \times 253 K = 303.6 K = 30.6 ° C = 31 ° C$

Stream:NEETSubject:PhysicsTopic:Heat & ThermoSubtopic:Second Law of Thermodynamics

⏱ 2mℹ️ Source: PYQ_2015

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