According to Newton s law of cooling The change of temperature of a body is proportional to the difference between the temperature of a body and that of the surrounding medium . If t1 is the initial temperature of the body and t2 is the constant temperature of the medium, T be the temperature of the body at any time t then find the expression for T as a function of t1 , t2 and time t.

According to Newton s law of cooling The change of temperature of a b

1.	According to Newton s law of cooling The change of temperature of a body is proportional to the difference between the temperature of a body and that of the surrounding medium . If t1 is the initial temperature of the body and t2 is the constant temperature of the medium, T be the temperature of the body at any time t then find the expression for T as a function of t1 , t2 and time t.
A.	T=t<sub>1</sub>+(t<sub>2</sub>) e<sup>-kt</sup>
B.	T=t<sub>2</sub>+(t<sub>1</sub>-t<sub>2</sub>) e<sup>-kt</sup>
C.	T=t<sub>1</sub>+(t<sub>1</sub>-t<sub>2</sub>) e<sup>kt</sup>
D.	T=t<sub>2</sub>+(t<sub>1</sub>) e<sup>kt</sup>
Answer» C. T=t<sub>1</sub>+(t<sub>1</sub>-t<sub>2</sub>) e<sup>kt</sup>