Discussion
Newton's law of cooling leads to a differential equation stating that the rate of temperature fall is proportional to
Answer: D
The law gives \( d\theta/dt = -k(\theta - \theta_{s}) \), whose solution is an exponential decay towards the surrounding temperature. The fourth power belongs to radiative transfer by Stefan's law, which the cooling law approximates for a small excess, and proportionality to elapsed time would give a straight-line fall rather than an exponential one
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