An ideal Carnot heat engine with an efficiency of $30\%$.It absorbs heat from a hot reservoir at $727^o C$. The temperature of the cold reservoir is .... $^oC$
Medium
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$\eta=1-\frac{T_{2}}{T_{1}}$
$\frac{T_{2}}{T_{1}}=0.7$
$\mathrm{T}_{1}=1000 \mathrm{K}$
$\mathrm{T}_{2}=0.7 \times 1000$
$\mathrm{T}_{2}=700 \mathrm{K}$
$\mathrm{T}_{2}=427^{\circ} \mathrm{C}$
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