Question: A certain solar-energy collector produces a maximum temperature of 100C. The energy is used in a cyclic heat engine that operates in a 10C environment.

A certain solar-energy collector produces a maximum temperature of 100°C. The energy is used in a cyclic heat engine that operates in a 10°C environment. What is the maximum thermal efficiency? What is it, if the collector is redesigned to focus the incoming light to produce a maximum temperature of 300°C?

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