Assertion : Bodies radiate heat at all temper | vedclass

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Question

(A) All bodies at a temperature above absolute zero $(0 \ K)$ emit thermal radiation. This is a consequence of the thermal motion of charged particles

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) All bodies at a temperature above absolute zero $(0 \ K)$ emit thermal radiation. This is a consequence of the thermal motion of charged particles within the matter.According to the Stefan-Boltzmann law,the total energy radiated per unit surface area of a black body per unit time $(E)$ is directly proportional to the fourth power of its absolute temperature $(T)$: $E = \sigma T^4$,where $\sigma$ is the Stefan-Boltzmann constant.Since the Assertion states that bodies radiate heat at all temperatures (above $0 \ K$) and the Reason provides the correct physical law governing the rate of this radiation,the Reason correctly explains the Assertion.

$Assertion :$ Bodies radiate heat at all temperatures.
$Reason :$ Rate of radiation of heat is proportional to the fourth power of absolute temperature.

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$Assertion :$ Bodies radiate heat at all temperatures.$Reason :$ Rate of radiation of heat is proportional to the fourth power of absolute temperature.