Question

Why is calorimeter painted black in the exp of newton’s law of cooling ?

Answer 1

Explanation:

Newton's Law of Cooling states that the rate of change of the temperature of an object is proportional to the difference between its own temperature and the ambient temperature (i.e. the temperature of its surroundings). ... Newton's Law would enable us to solve the following problem.

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Answer 2

Black surfaces are good emitters and good absorbers of heat radiation. Hence to provide a more vivid and wide range of experimental results, black surfaces are used in calorimeter in such cases.