Class 11Physics2 Thermal Properties of Matter: Heat TransferRadiation (General, Kirchoff's law, Black body, Prevost's Theory)
MediumWhy is the Sun considered a perfect black body?
(N/A) perfect black body is defined as an object that absorbs all incident radiation and emits all wavelengths of the electromagnetic spectrum. The Sun emits radiation across a continuous range of wavelengths,covering the entire spectrum from ultraviolet to infrared. Because it emits all possible wavelengths of radiation,it is considered a perfect black body.
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Similar Questions
$x$ joule of heat is incident on a body. Out of it, the total heat reflected and transmitted by it is $y$ joule. The absorption coefficient of the body is
Heat radiations propagate with the speed of
Easy
View Solution$Assertion :$ $A$ body that is a good radiator is also a good absorber of radiation at a given wavelength.
$Reason :$ According to Kirchhoff's law,the absorptivity of a body is equal to its emissivity at a given wavelength.
$Reason :$ According to Kirchhoff's law,the absorptivity of a body is equal to its emissivity at a given wavelength.
The graph shown in the adjacent diagram represents the variation of temperature $(T)$ of two bodies,$x$ and $y$,having the same surface area,with time $(t)$ due to the emission of radiation. Find the correct relation between their emissivities $(e)$ and absorptive powers $(a)$.
MediumIIT 2003
View SolutionInfrared radiation is detected by
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