Question

. A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the : (1) • temperature of the object • temperature of the surroundings • temperature difference between the object and its surroundings • average temperature of the object and its surroundings

Answer 1

Radiation

The rate heat lost though radiation depends on the temperature difference between the object and its surroundings.

Explanation

Heat loss through is given by

$P=\epsilon\sigma A(T^4-T_0^4)$

where

$\epsilon$ = Emissivity of the object

$\sigma$ = Stefan-Boltzmann constant = $5.67\times 10^{-8}\ \text{W/m}^2\text{K}^4$

A = Surface area of object

T = Temperature of object in Kelvin

$T_0$ = Temperature of surrounding in Kelvin.

It can be seen that rate heat lost though radiation depends on the temperature difference between the object and its surroundings.

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