Question

The temperature of a body falls from ${40}^{o}C$ to ${36}^{o}C$ in 5 minutes. The temperature of the body will become ${32}^{o}C$ in

• A. less than 10 minutes
• B. 10 minutes
• C. more than 10 minutes
• D. None of these

Answer 1

Answer: (C)

more than 10 minutes

We know that: $\frac{d\theta }{dt}=\frac{{\theta }_1-{\theta }_2}{t}$
So, $\frac{40-36}{5}=\frac{32}{t}$
Hence, $t=40minute$

So, it will take more than 10 minute.