A solar-energy collector produces a maximum temperature of 100oC. The collected energy is used in a cyclic

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A solar-energy collector produces a maximum temperature of 100oC. The collected energy is used in a cyclic heat engine that operates in a 5oC environment.
(a) What is the maximum thermal efficiency?
(b) What-if Scenario: What would the maximum efficiency be if the collector were redesigned to focus the incoming light to enhance the maximum temperature to 400oC?
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