A full radiator at `0^(@)C` radiates energy at the rate of `3.2 xx 10^(4) erg cm^(-2) s^(-1)`. Find (i) Stefan's constant and (ii) the amount of heat radiated per second by a sphere of radius 4 cm and at a temperature of `1000^(@)C`.

A black body at 227^(@)C radiates heat at the rate of cal cm^(-2) s^(-1) . At a temperature of 727^(@)C , the rate of heat radiated in the same unit 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

A black body at temperature 227^(@)C radiates heat at the rate of 5 cal/ cm^(2) , at a temperature of 27^(@)C , the rate of heat radiated per unit area per unit time in cal/ cm^(2) s, is

A black body at ' 227^@ ' C radiates heat at the rate of ' 10 cal/cm^2s. At a temperature of '727^@' C the rate of heat radiated in same units will be

If each square metre, of sun's surface radiates energy at the rate of 6.3xx10^(7) jm^(-2) s^(-1) and the Stefan's constant is 5.669xx10^(-8) Wm^(-2) K^(-4) calculate the temperature of the sun's surface, assuming Stefan's law applies to the sun's radiation.

Three cubes of sides 1,2,3 cm are at constant temperature of 100^(@)C . Then the amount of heat lost per second by them are in the ratio

A black body of 127^(@)C radiates heat at the rate of 5cal//cm^(2) -second. At 527^(@)C , the rate of heat radiated in the same units will be

A body at 300^(@)C radiates 10 J cm^(-2) s^(-1) . If Sun radiates 10^(5) Jcm^(-2) s^(-1) ,then its temperature is: