A body cools from 80°C to 60°C in 5 minutes. The surrounding temperature is 20°C. How much time does it take to cool from 60°C to 40°C?
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A body cools from 80°C to 60°C in 5 minutes. The surrounding temperature is 20°C. How much time does it take to cool from 60°C to 40°C?

G1 Physics · Accepted Answer

Use Stefan-Boltzmann law P=eσA(T⁴−Tₛ⁴), Wien's law λₘT=b, or Newton's law of cooling dθ/dt=−k(θ−θₛ), as applicable. Evaluating the given data/statements gives A: 500 s. Therefore the correct answer is A.