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Which consequence results when radioisotope thermoelectric generators deplete fuel?

A)Power output declines exponentially
B)Seebeck coefficient improves gradually
C)Thermal conductivity decreases linearly
D)Internal resistance drops asymptotically

💡 Explanation

Lower isotope abundance reduces heat production via radioactive decay, therefore, power decreases because the Seebeck effect remains constant, rather than gradual temperature increases, because reduced heat flow means lessened electromotive force.

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