Find the temperature of an oven if it radiates `8.28` cal per second through an opening whose area is `6.1cm cm^(2)` Assume that the radiation is close to that of a black body ? .

Find the temperatue of an oven if it radiates 8.28 cal per second through an opening, whose area is 6.1 cm^(2) . Assume that the radiation is close to that of a black body.

The temperature of the tungsten filament of a 40 watt lamp is 1655^(@)C. The effective surface area of the filament is 0.85 cm^(2). Assuming that the energy radiated from the filament is 60% of that of a black body radiator at the same temperature, find the value of Stefan's constant.

One end of a rod of length 20cm is inserted in a furnace at 800K The sides of the rod are covered with an insulating material and the other end emits radiation like a black body. The temperature of this end is 750K in the steady state The temperature of the surrounding air is 300K Assuming radiation to be the only important mode of energy transfer between the surrounding and the open end of the rod, find the thermal conductivity of the rod Stefan's constant sigma = 6.0 xx 10^(-8) W m^(-2) K^(-4) .

The sun radiates energy at the rate of 6.4xx10^(7)Wm^(-2) . Calculate its temperature assuming it to be a black body.

A black body at a temperature of 127^(@)C raidates heat at the rate of 1cal//cm xx sec . At a temperature of 527^(@)C the rate of heat radiation from the body in (cal//cmxx sec) will be

A black body at a temperature of 227^(@)C radiates heat energy at the rate of 5 cal/cm-sec. At a temperature of 727^(@)C , the rate of heat radiated per unit area in cal/cm will be

If the temperature of a black body becomes half of its original temperature, then the amount of radiation emitted by the body per second will be reduced to