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`)

A metal cube of length 10 cm radiates heat at the rate of 60 watt. Find its emissive power of a perfectly black body at that temperature.

A metal cube of each side 0.05 m long emits 0.6k cal in 80 seconds, Calculate the emissive power of its surface.

A metal cube of each side 2 cm long emits 0.16 kcal of heat in 100s. Calculate the emissive power of the cube in joule at that temperature. J = 4200 J//kcal .

A body having a surface area of 50cm^2 radiates 300J of energy per minute at a temperature of 727^(@)C . The emissivity of the body is ( Stefan's constant =5.67xx10^(-8)W//m^2K^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 )

A filament of an evacuated light blue has length 10 cm, diameter 0.2mm and emissivity 0.2. Calculate the power it radiates at 2000 K ( sigma=5.67xx10^-8 J/m^2k^4 )

A metal cube has each side 2.5 cm long and radiates 0.36 kcal//min . What is the emissive power of its surface? If the emissivity of its surface is 0.4, what would be the emissive power of the cube if it were perfectly black?

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 )

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))