An exposure results in 250,000 heat units. How long will it take the anode to cool to 100,000 heat units?

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Multiple Choice

An exposure results in 250,000 heat units. How long will it take the anode to cool to 100,000 heat units?

Explanation:
Anode cooling follows exponential decay: the heat content drops by about the same fraction in each equal time interval. Starting at 250,000 heat units, reaching 100,000 means the heat has fallen to 40% of its initial value. With exponential cooling, that 40% drop occurs after about three minutes. For intuition, you’d see roughly 184,000 after one minute, ~136,000 after two minutes, and about 100,000 after three minutes. So the time needed is three minutes.

Anode cooling follows exponential decay: the heat content drops by about the same fraction in each equal time interval. Starting at 250,000 heat units, reaching 100,000 means the heat has fallen to 40% of its initial value. With exponential cooling, that 40% drop occurs after about three minutes. For intuition, you’d see roughly 184,000 after one minute, ~136,000 after two minutes, and about 100,000 after three minutes. So the time needed is three minutes.

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