If T1 and T2 be the highest and lowest absolute temperatures encountered in a heat pump operating on a reversed Carnot cycle, then its COP is equal to
1
\(\frac{T_1-T_2}{T_1}\)
2
\(\frac{T_1-T_2}{T_2}\)
3
\(\frac{T_2}{T_1-T_2}\)
4
\(\frac{T_1}{T_1-T_2}\)
5
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