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`)

A 100 watt filament loses all its power by radiation, when it is heated to a temperature 2500 K. If the diameter of the filament is 0.2mm and emissivity of the filament is 0.5, find the length of the filament to ( sigma = 5.67 xx 10^-8 J//m^2sK^4 )

The temperature of the filaments of a 100W electric lamp is 2727^@C . The emissivity of the surface of the filament is 0.086 and its radius is 0.5 mm. Find the length of the filament. sigma = 5.7 xx 10^-8 S.I. units.

Energy is emitted from a hole in an electric furnace at the rate of 20W when that temperature of the furnace is 727^@C . What is the area of the hole ( sigma = 5.7 xx 10^-8 Js^-1m^-2K^-4 )

A 100 watt filament loses all its power by radiation when it is heated to a temperature of 2500 K. If the diameter of the filament is 0.2 mm and the surface emissivity of the filament is 0.5, find the length of the filament. (Stefan's constant sigma = 5.67 xx10^-8 W/m^2k^4 )

Energy is emitted from a hole in an electric furnace at the rate of 20 watt when furnace is at 227^@C . Find the area of the hole, sigma = 5.7 xx 10^-8 S.I . units.

The susceptibility of magnesium at 300 K is 2.4 xx 10^-5 . At what temperature will the susceptibility increase to 3.6 xx 10^-5 ?

The susceptibility of magnesium at 300 K is 1.2 xx 10^-5 . At what temperature will the susceptibility increase to 1.8 xx 10^-5 ?

A metal ball of surface area 200 cm^(2) and temperature 527^(@)C is surrounded by a vessel at 27^(@)C . If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is (sigma = 5.67 xx10^(-8)J//m^(2)-s-k^(4))

A metal cube has each side of length 1 m losses all its energy at a rate of 3000 watt. If the emissity is 0.4, Find its temperature (Given:a= 5.767xx10^-8J//m^2sk^-1 )