Stefan-Boltzmann constant.
what is it

Open in App

Solution

The Stefan–Boltzmann constant (also Stefan's constant), a physical constant denoted by the Greek letter $σ$ , is the constant of proportionality in the stefan-boltzmann law the total energy radiated per unit surface area of a black body in unit time is proportional to the fourth power of the thermodynamic temperature
The value of the Stefan–Boltzmann constant is given in SI Units by
$σ = 5.670 3 73(21) \times 10 -8 W m -2 K -4$

Suggest Corrections

Similar questions

Q. Stefan-Boltzmanns Law for a perfect black body is represented by

Q. The dimensions of Stefan-Boltzmann constant

σ

can be written in terms of Planck's constant

h

, Boltzmann constant

K_{B}

and the speed of light

c

σ = h^{α} K_{B}

^{β} c^{γ}

. Here,

A human body has a surface area of approximately $1 m^{2}$ . The normal body temperature is $10 K$ above the surrounding room temperature $T_{0}$ . Take the room temperature to he $T_{0} = 300 K$ . For $T_{0} = 300 K$ the value of $σ T_{0}^{4} = 460 W m^{- 2}$ (where $σ$ is the Stefan-Boltzmann constant). Which of the following options is/are correct?