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Thermodynamics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsThermodynamics3 Marks
Question
A refrigerator is to maintain eatables kept inside at $9^{\circ} \mathrm{C}$. If room temperature is $36^{\circ} \mathrm{C}$, calculate the coefficient of performance.
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Answer

Temperature inside the refrigerator, $\mathrm{T}_1=9^{\circ} \mathrm{C}=282 \mathrm{~K}$ Room temperature, $\mathrm{T}_2=36^{\circ} \mathrm{C}=309 \mathrm{~K}$ Coefficient of performance $=T_1 / T_2-T_1=282 / 309-282=282 / 27=10.44$ Therefore, the coefficient of performance of the given refrigerator is 10.44.

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