What is the temperature range up to which Newton's law of cooling holds good?
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Solution
Newton's law of cooling
It states that the rate of heat loss from a body is directly related to the temperature difference between the body & its surroundings, provided the difference is small.
According to Newton's law of cooling, the rate of loss of heat, that is of the body is directly proportional to the difference of temperature is, of the body and the surroundings.
The rate of loss of heat due to convection is proportional to the temperature difference for small temperature differences only.
Hence, Newton's law of cooling holds good only if the temperature difference between the body and the surroundings is less than .