At what temperature will the filament of 100 W lamp operate if it is supposed to be perfectly black of area `1 cm^(2)`.
Given `sigma = 5.67 xx 10^(-5) erg cm^(-2) s^(-1) K^(-4)`.

Calculate the temperature (in K) at which a perfect black body radiates energy at the rate of 5.67W cm^(-2) . Given sigma = 5.67 xx 10^(8)Wm^(-2)K^(-4) .

Calculate the energy radiated in one minute by a blackbody of surface area 200 cm^2 at 127 ""^(@)C ( sigma= 5.7 xx 10^(-8) J m^(-2) s^(-1) 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^(-8) W m^(-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)

A metallic ball of surface area 300 cm^2 at a temperature of 227^@C is placed in a container at 27^@C . Calculate the rate of loss of heat radiation by the ball if emissivity of ball is 0.3, sigma = 5.67 xx 10^(-5) erg cm^(-2) s^(-1) K^(-4) .

A heated filament of a bulb is radiating maximum energy at wavelength 3.14 xx 10^(-5) cm. Determine the total amount of energy lost per second per unit area by the filament if the temperature of the surrounding air is 20^@C . Take, b = 0.288 cm K sigma = 5.77 xx 10^(-5) erg s^(-1) cm^(-2) K^(-4)

A small hole is made in a hollow sphere whose walls are at 723^(@)C . Find the total energy radiated per seond per cm^(2) . Given Stenfan's constant = 5.7 xx 10^(-5) erg cm^(-2) s^(-1) K^(-4) .

A 300 W lamp loses all its energy by emission of radiation from the surface of its filament. If the area of surface of filament is 2.4cm^(2) and is of emissivity 0.4, estimate its temperature. Given that sigma = 1.36 xx 10^(-12) cal cm^(-2) s^(-1) K^(-4) J=4.2 J cal^(-1) . Neglect the absorption from the surroundings.

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)