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)`.

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)

The operating temperature of a tungesten filament in an indandescent lamp is 2000 K and its emissivity is 0.3 . Find the surface area of the filament of a 25 watt lamp. Stefan's constant sigma = 5.67xx10^(-8) Wm^(-2)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) .

What will be the surface area of a filament of 200 W incandescent lamp at 2000 K. sigma = 5.67 xx 10^(-8) Wm^(-2) K^(-4) and emissivity e = 0.3?

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.

A 500W lamp loses all of its energy by emission of radiation from the surface. If the area of the surface of the filament is 2.0cm^(2) and its emissivity is 0.5, estimate the temperature of its filameiit. Given that Stefan constant, sigma =5.7xx10^(-8)W//m^(2)K^(4). Neglect radiation receivedby lamp from surrounding.

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 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)

An incandesent light bulb has a tungsten filament that is heated to a temperature 3 xx 106(3)K when an electric current passes through it If the surface area of the filament is approximately 10^(-4)m m^(2) and it has an emissivity of 0.3 the power radiated by the bulb is nearly (sigam = 5.67 xx 10^(-8) W m^(-2) K^(-4)) .