A blackbody of surface area `1cm^(2)` is placed inside an enclosure. The enclosure has a constant temperature `27(@)C` and the blackbody is maintained at `327(@)C` by heating it electrically. What electric power is needed to maintain the temperature? `sigma=6.0xx10^(-s)Wm^(-2)K(-2)` .

A blackbody of surface area 10cm^(2) is heated to 127^(@)C and is suspended in a room at temperature 27^(@)C calculate the initial rate of loss of heat from the body to the room.

A blackbody of surface area 10cm^(2) is heated to 127^(@)C and is suspended in a room at temperature 27^(@)C calculate the initial rate of loss of heat from the body to the room.

A blackbody of sarface area 10cm^(2) is heated to 127^(@)C and is suspended in a room at temperature 27^(@)C calculate the initial rate of loss of heat from the body to the room.

A spherical tungsten pices of radius 1.0cm is suspended in an evacuated chamber maintained at 300K. The pices is maintained at 1000K by heating it electrically. Find the rate at which the electrical energy must be supplied. The emissivity of tungsten is 0.30 and the Stefan constant sigma is 6.0xx10^(-s)Wm^(-2)K^(-4) .

A spherical tungsten pieces of radius 1.0cm is suspended in an evacuated chamber maintained at 300K . The pieces is maintained at 1000K by heating it electrically. Find the rate at which the electrical energy must be supplied. The emissivity of tungsten is 0.30 and the Stefan constant sigma is 6.0xx10^(-s)Wm^(-2)K^(-4) .

A spherical tungsten pieces of radius 1.0cm is suspended in an evacuated chamber maintained at 300K . The pieces is maintained at 1000K by heating it electrically. Find the rate at which the electrical energy must be supplied. The emissivity of tungsten is 0.30 and the Stefan constant sigma is 6.0xx10^(-s)Wm^(-2)K^(-4) .

A thin brass rectangular sheet of sides 10 cm and 5 cm is heated in a furnace to 500^(@) C and taken out. How much electric power is needed to maintain the sheet at this temperature ? Its emissivity is 0.25.

An electric heater emits 1000W of thermal radiation. The coil has a surface area of 0.02m^(2) . Assuming that the coil radiates like a blackbody, Find its temperature. sigma=6.0xx10^(-8)Wm^(-2)K^(-2) .

An electric heater emits 1000W of thermal radiation. The coil has a surface area of 0.02m^(2) . Assuming that the coil radiates like a blackbody, Find its temperature. sigma=6.0xx10^(-8)Wm^(-2)K^(-2) .