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 power of an incandescent lamp whose filament has a surface area of 0.19 cm^(2) and is at a temperature of 3645K. Emmisivity of the surface is 0.4, sigma = 5.7xx10^(-8)Wm^(-2)K^(-4) ?

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 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))

A 60 watt filament lamp loses all its energy by radiation from its surface. The emissivity of the surface is 0.5. The area of the surface is 5 xx 10^-5m^3 . Find the temperature of the filament ( sigma = 5.67 xx 10^-8m^2s^-4K^-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 much energy in radiated per minute from the filament of an incandescent lamp at 3000 K, if the surface area is 10^(-4)m^(2) and its emissivity is 0.4 ? Stefan's constant sigma = 5.67 xx 10^(-8) Wm^(-2)K^(-4) .

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))

Calculate the energy radiated per second from the filament of an incandescent lamp at 2000K, if the surface area is 5.0 xx 10^(-5) m^(-2) and its relative emittance is 0.85 & sigma = 5.7 xx 10^(-8) W m^(-2) K^(-4)

According to Stefan's law of radiation, a black body radiates energy sigmaT^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 detonated, it reaches temperature of 10^6 K and can be treated as a black body. Estimate the power it radiates