WAEC Physics 2018 Objective — Question 12

Question 12 of 50 from the West African Examinations Council (WAEC) Physics 2018 Objective paper, with the correct answer and a full explanation.

According to Newton's law of cooling, the heat energy lost per unit area of a body depends on the I. Surface area II. Nature of the surface III. Temperature of the surface IV. Excess temperature over the surroundings

A. I and II only
B. II and IV onlyCorrect
C. I, II and III
D. I, III and IV

Explanation

Since the loss is already expressed per unit area, surface area (I) is not an independent factor; the rate depends on the nature of the surface (II) and the excess temperature over the surroundings (IV).

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