A glass full of hot milk is poured on the table. It begins to cool gradually. Which of the following is correct

Options

A. The rate of cooling is constant till milk attains the temperature of the surrounding.
B. The temperature of milk falls off exponentially with time.
C. While cooling, there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools.
D. All three phenomenon, conduction convection and radiation are responsible for the loss of heat from milk to the surroundings.

Answer

B, C, D

Explanation

When hot milk is spread on table, then heat transfer in surrounding will be through conduction, convection and radiation.
According to Stefan-Boltzmann laws, temp. of milk decreases with power of temperature.
Heat is transferred from surroundings to milk but it is less than that from milk to surrounding.