Qstnid -Ii-4-the Thermal Radiation Emitted By A Body Is Proportional To T<sup>n</sup> Where T Is Its Absolute Temperature. The Value Of N Is Exactly 4 For - 28: Heat Transfer - Neet-xii-physics

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NEET-XII-Physics

28: Heat Transfer

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Qstn# ii-4 Prvs-Qstn Next-Qstn

#4
The thermal radiation emitted by a body is proportional to Tⁿ where T is its absolute temperature. The value of n is exactly 4 for
(a) a blackbody
(b) all bodies
(c) bodies painted black only
(d) polished bodies only
digAnsr: b
Ans : (b) all bodies
From Stefan-Boltzmann law, the energy of the thermal radiation emitted per unit time by a blackbody of surface area A is given by
`` u=\sigma A{T}^{4}``
Here, `` \sigma `` is Stefan-Boltzmann constant.
This law holds true for all the bodies.
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