# For an ideal heat engine,the temperature of the source is . In order to have 60% efficiency the temperature of the sink should be __________  (Rounded off to the nearest integer) Option: 1 -113 Option: 2 12 Option: 3 18 Option: 4 17

$\begin{array}{l} \mathrm{n}=0.60=1=\frac{\mathrm{T}_{\mathrm{L}}}{\mathrm{T}_{\mathrm{H}}} \\ \\ \frac{\mathrm{T}_{\mathrm{L}}}{\mathrm{T}_{\mathrm{H}}}=0.4 \Rightarrow \mathrm{T}_{\mathrm{L}}=0.4 \times 400 =160 \mathrm{~K} =-113^{\circ} \mathrm{C} \end{array}$

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