What is Stefan's constant ?

The dimension of sigma b^4 (where sigma is Stefan's constant and b is Wien's constant) are [ML^4 T^(-3)] is it true.

Assuming the Sun to be a spherical body of radius R at a temperature of TK, evaluate the total radiant powered incident of Earth at a distance r from the sun where r_0 is the radius of the Earth and sigma is Stefan's constant.

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r whose outer surface radiates as a black body at a temperature T K is given by (where sigma is Stefan's constant)

The correct order in which the dimensions of ''time'' decreases in the following physical quantities is (A) Stefan's constant (B) Coeffecient of volume expansion (C ) Work (D) Velocity gradient

If each square cm of the sun's surface radiates energy at the rate of 6.42xx10^(3) Js^(-1) cm^(-2) , calculate the temperature of the sun's surface in degree celsius, assuming Stefan's law applies to the radiation. (Stefan's constant = 5.67xx10^(-8)Wm^(-2)K^(-4) )

If the filament of a 100 W bulb has an area 0.25cm^2 and behaves as a perfect black body. Find the wavelength corresponding to the maximum in its energy distribution. Given that Stefan's constant is sigma=5.67xx10^(-8) J//m^(2)s K^(4) .

If the filament of a 100 W bulb has an area 0.25cm^2 and behaves as a perfect block body. Find the wavelength corresponding to the maximum in its energy distribution. Given that Stefan's constant is sigma=5.67xx10^(-8) J//m^(2)s K^(4) .

Assuming the sun to have a spherical outer surface of radius r radiating like a black body at temperature t^(@)C . The power received by a unit surface (normal to the incident rays) at a distance R from the centre of the sun is where sigma is the Stefan's constant.

Calculate the black body temperature of the sun from th e following data :- Stefan's constant = 5.7xx10^(-8) Wm^(-2)K^(-4) . Solar constant = 1500 W//M^(2) . Radius of the sun = 7xx10^(8) m . Distance between sun and earth = 1.5xx10^(11) m .

A black body of mass 34.38 g and surface area 19.2cm^(2) is at an intial temperature of 400 K. It is allowed to cool inside an evacuated enclosure kept at constant temperature 300 K. The rate of cooling is 0.04^(@)C//s . The sepcific heat of the body J kg^(-1)K^(-1) is (Stefan's constant, sigma = 5.73 xx 10^(-8)Wm^(-2)K^(-4))