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 only
C. I, II and III
D. I, II and IV

Correct Answer: Option C

C. I, II and III

Explanation

The rate of cooling of liquid according to Newton’s law of cooling depends on:

– Temperature of the liquid

– Temperature of the enclosure

– The area of the exposed surface

– The nature and extent of the surface of the containing vessel