How many watt of energy is required to keep a black body in the form of a cube of side `1cm` at `2000K` (Temprature of surroding is `27^(@)c` and `sigma = 5.57 xx 10^(-5) Wm^(-2) K^(-4)`.

The radiant power of a furnace of surface area of 0.6m^(2) is 34.2KW The temperature of the furance s [sigma = 5.7 xx 10^(-8) Wm^(-2) K^(-4) .

Calculate the amount of radiant energy from a black body at a temperature of (i) 27^(@) C (ii) 2727^(@) C. sigma = 5.67xx10^(-8)Wm^(-2)K^(-4) .

The power of a black body at temperature 200K is 544 watt. Its surface area is (sigma = 5.67 xx 10^(-8) wm^(-2) K^(-4))

Calculate the temperature at which a perfect black body radiates at the rate of 1 W cm^(-2) , value of Stefan's constant, sigma = 5.67 xx 10^(-5) W m^(-2) K^(-8)

Calculate the temperature at which a perfect black body radiates at the rate of 1 W cm^(-2) , value of Stefan's constant, sigma = 5.67 xx 10^(-5) W m^(-2) K^(-8)

Calculate the temperature at which a perfect black body radiates at the rate of 1 W cm^(-2) , value of Stefan's constant, sigma = 5.67 xx 10^(-8) W m^(-2)K^(-4)

Calculate the energy radiated per minute by a black body of surface area 200 cm^(2) , maintained at 127^(@) C. sigma = 5.7xx10^(-8)Wm^(-2)K^(-4)

How many watt be radiated by a spherical black body of radius 7 cm at 1000 K ?

The earth receives solar energy at the rate of 2 cal Cm^(-2) per minute. Assuming theradiation tobeblack body in character, estimate the surface temperature of the sun. Given that sigma =5.67 xx10^(-8) Wm^(-2)K^(-4) and angular diameter of the sun =32 minute of arc.