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← ScienceWhich risk increases when a spacecraft's radioisotope thermoelectric generator (RTG) degrades?
A)Coolant leakage increases dramatically.
B)Power output declines exponentially.✓
C)Thermal radiation pattern destabilizes.
D)Structural integrity decreases linearly.
💡 Explanation
Power output declines because beta decay weakens the thermoelectric conversion efficiency. Therefore, power degrades exponentially rather than linearly, and coolant leaks are related to design, not decay; radiation patterns are stable.
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