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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Laxmi Mahato posted an Question
February 29, 2020 • 20:34 pm
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50 points
50 points
- IIT JAM
- Physics (PH)
In ferry's black body the hole is act as black body not the surface.i wanna know that the surface of the sphere absorbed all the radition then why only the hole
in ferry's black body the hole is act as black body not the surface.i wanna know that the surface of the sphere absorbed all the radition then why only the hole act as black body
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Paltu Sen![best-answer]()
A perfect blackbody is an idealized object which absorb radiations of all wavelengths from zero to infinity. Ferry's blackbody is just a model ( a structure that resembles the original behaviour) of a blackbody. The material of the body is not a blackbody, it is the shape of the body that makes the hole to act like a blackbody. When a light enters into the hole it suffers a large number of reflections and in each reflection the wave gets absorbed (wave-amplitude decreases) by little amount. Thus within the sphere the wave is being abosrbed gradually. But if light falls on the outer surface of the sphere some portion of it gets reflected. So surface of sphere doesn't act like a blackbody, it is the hole of sphere that absorbs the radiation.