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 .

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 ?

If the sun's surface radiates heat at 6.3 xx 10^(7) Wm^(-2) . Calculate the temperature of the sun assuming it to be a black body (sigma = 5.7 xx 10^(-8)Wm^(-2)K^(-4))

The power of black body at temperature 200 K is 544 W .Its surface area is (sigma=5.67xx10^(-8)Wm^(-2)K^(-2))

A black body at 127^(@)C emits the energy at the rate of 10^(6)J//m^(2) s the temperature of a black body at which the rate of energy emission is 16 xx 10^(6)J//m^(2)s is .

At what temperature, a perfectly black body would radiate energy at a rate of 90.72xx10^(4)W//m^(2) ?

Calculate the energy radiation by the sun in 2 mins if it is considered to be perfect sphere of radius 6.8 xx 10^8 m and its surface temperature is approximately 6200 K. Take sigma = 5.67 xx 10^(-8) Jm^(-2) s^(-1) K^(-4)

A hot body at 800^@C is radiating 500 J of energy per minute. Calculate the surface area of the body if emissivity is 0.23 and Stefan's constant is 5.67 xx 10^(-8) Wm^(-2) K^(.-4) .

A black body radiates energy at the rate of E W//m at a high temperature TK . When the temperature is reduced to (T)/(2)K , the radiant energy will b