Newton’s law of cooling, holds good only if temperature difference between body and surroundin

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10-2.Transmission of Heat

easy

Newton’s law of cooling, holds good only if the temperature difference between the body and the surroundings is

Less than ${10^o}C$

More than ${10^o}C$

Less than ${100^o}C$

More than ${100^o}C$

Solution

(a) When temperature difference between the body and the surroundings is small, then loss of heat energy from the body is mainly due to the process of convection. In such a case, the rate of cooling of the body is governed by Newton's law of cooling.

Standard 11

Physics

$Assertion :$ Perspiration from human body helps in cooling the body.
$Reason :$ A thin layer of water on the skin enhances its emissivity.

easy

(AIIMS-2006)

A body cools in $7$ minutes from ${60^o}C$ to ${40^o}C$ What time (in minutes) does it take to cool from ${40^o}C$ to ${28^o}C$ if the surrounding temperature is ${10^o}C$? Assume Newton’s Law of cooling holds

medium

Newton's law of cooling is used in laboratory for the determination of the

easy

A sphere, a cube and a disc all of the same material, quality and volume are heated to $600\,^oC$ and left in air. Which of these will have the lowest rate of cooling ?

easy

A solid sphere of radius $R$ and a hollow sphere of inner radius $r$ and outer radius $R$ made of copper are heated to the same temperature and are allowed to cool in the same environment. Then, choose the $CORRECT$ statement

medium

Newton’s law of cooling, holds good only if the temperature difference between the body and the surroundings is

Solution

Similar Questions

$Assertion :$ Perspiration from human body helps in cooling the body. $Reason :$ A thin layer of water on the skin enhances its emissivity.

A body cools in $7$ minutes from ${60^o}C$ to ${40^o}C$ What time (in minutes) does it take to cool from ${40^o}C$ to ${28^o}C$ if the surrounding temperature is ${10^o}C$? Assume Newton’s Law of cooling holds

Newton's law of cooling is used in laboratory for the determination of the

A sphere, a cube and a disc all of the same material, quality and volume are heated to $600\,^oC$ and left in air. Which of these will have the lowest rate of cooling ?

A solid sphere of radius $R$ and a hollow sphere of inner radius $r$ and outer radius $R$ made of copper are heated to the same temperature and are allowed to cool in the same environment. Then, choose the $CORRECT$ statement

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$Assertion :$ Perspiration from human body helps in cooling the body.
$Reason :$ A thin layer of water on the skin enhances its emissivity.