Question

Which of the following graph is best explanation of cooling of hot water with time?

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

Answer 2

According to Newton(s) law of cooling. The

temperature difference

$\Delta T = T_{2} - T_{1} = ce^{- Kt}$ ….(i)

Where c and K are positive constants.

From the above expression the temperature

difference is exponentially decreasing with time.

Hence the curve (3) is correct option.