First slide

Refrigerator

Question

An ideal refrigerator has a freezer at a temperature of – $13^{0} C$ . The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) will be

Easy

A

$325^{0} C$
B

325K
C

39°C
D

320°C

Solution

$\beta = \frac{{{T_2}}}{{{T_1} - {T_2}}} \Rightarrow 5 = \frac{{260}}{{{T_1} - 260}}$
$T_{1}$ = 312k ⇒ $T_{1}$ = 3 $9^{0}$ C

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