Home
Class 12
PHYSICS
A body in a room cools from 85^(@)C to 8...

A body in a room cools from `85^(@)C` to `80^(@)C` in 9 minutes. The time taken to cool from `80^(@)C` to `75^(@)C` is :

A

9 minutes

B

less than 9 minutes

C

more than 9 minutes

D

ether less or more than five minutes.

Text Solution

Verified by Experts

The correct Answer is:
C
Since temperature difference between body and surrounding keeps on decreasing.
`:.` By Newton.s law of cooling the rate of loss of heat decreases
`rArr` time increases.
Hence correct choice is (c ).
Promotional Banner

Topper's Solved these Questions

  • TRANSFERENCE OF HEAT

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level - II)|49 Videos

  • TRANSFERENCE OF HEAT

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level - III) Questions From AIEEE/JEE Examination)|5 Videos

  • SOLIDS & SEMICONDUCTOR DEVICES

    MODERN PUBLICATION|Exercise Revision Test|28 Videos

  • UNIFORM CIRCULAR MOTION

    MODERN PUBLICATION|Exercise Revision Test |57 Videos

Similar Questions

Explore conceptually related problems

A body cools from 80^(@)C to 50^(@) C in 5 minutes. Calculate the time it takes to cool from 60^(@)C to 30^(@)C . The temperature of the surroundings is 20^(@)C

A body cools from 80^(@)C to 70^(@)C in 6 minutes Under the saame external conditions to cool from 60^(@)C to 50^(@)C it will take

A bucket full of hot water is kept in a room. It cools from 75^(@)C to 70^(@)C in t_(1) minutes, from 70^(@)C to 65^(@)C in t_(2) minutes and from 65^(@)C to 60^(@)C in t_(3) minutes. Then

A hot body is allowed to cool . The surrounding temperature is constant at 30^(@) C . The body takes time t_(1) to cool from 90^(@) to 89^(@)C and time t_(2) to cool from 60^(@)C to 59.5 ^(@) C . Then ,