Physics-

General

Easy

Question

# A liquid cools down from to in 5 minutes. The time taken to cool it from to will be

- 5 minutes
- Lesser than 5 minutes
- Greater than 5 minutes
- Lesser or greater than 5 minutes depending upon the density of the liquid

## The correct answer is: Greater than 5 minutes

### According to Newton’s law of cooling

Rate of cooling mean temperature difference

Initially, mean temperature difference

Finally, mean temperature difference

In second case mean temperature difference decreases, so rate of fall of temperature decreases, so it takes more time to cool through the same range

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