Stefan's Law

If each square metre, of sun's surface radiates energy at the rate of 6.3xx10^(7) jm^(-2) s^(-1) and the Stefan's constant is 5.669xx10^(-8) Wm^(-2) K^(-4) calculate the temperature of the sun's surface, assuming Stefan's law applies to the sun's radiation.

Assertion : A solid sphere of copper of radius R and a hollow sphere of the same material of inner radius r and outer radius R are heated to the same temperature and allowed to cool in the same environment. The hollow sphere cools faster. Reason : Rate of cooling is according to Stefan's law which is E alpha T^(4)

Ac cording to Stefan' law of radiation, a black body radiates energy sigma T^4 from its unit surface area every second where T is the surface temperature of the black body and sigma = 5.67 xx 10^(-8) W//m^2 K^4 is known as Stefan's constant. A nuclear weapon may be thought of as a ball of radius 0.5 m When detoneted, it reachs temperature of 10^6 K and can be treated as a black body. (a) Estimate the power it radiates. (b) if surrounding has water at 30^@C how much water can 10% of the energy produced evaporate in 1s ? [s_w = 4186.0 J//Kg K and L_(upsilon) = 22.6 xx 10^5 J//kg] (c ) If all this energy U is in the form of radiation, corresponding momentum is p = U//c. How much momentum per unit time does it impart on unit area at a distance of 1 km ?

Stefan-Boltzman's Law|Questions

KirchhOFf’s law||Wien’s displacement law||Stefan’s radiation law

According to stefan's law of radiation a black body radiates energy sigmaT^(4) from is unit surface area every second where T is the surface temperature of the black body and sigma = 5.67 xx 10^(-8) W//m^(2) K^(4) is known as Stefan's of as a ball of radius 0.5m When detonated it reaches temperature of 10^(6)K and can be treated as a black body Estimate the power it radiates .

The SI unit of Stefan's constant is :

The MKS unit of Stefan's constant is

What are the dimensions of Stefan's constant ?

The value of Stefan's constant is