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Which of the following temperatures leads to the highest ideal Carnot efficiency? a. Hot = 500...

Which of the following temperatures leads to the highest ideal Carnot efficiency?

a. Hot = 500 K, Cold = 100 K

b. Hot = 1000 K, Cold = 100 K

c. Hot = 500 K, Cold = 450 K

d. Hot = 1000 K, Cold = 500 K

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