A spherical black body of radius 12 cm radiates 450W heat energy at 500K Now if the radius is reduced to half and temperature doubled, what will be the amount of heat radiated?

A spherical black body of radius 12 cm radiates 450 W power at 500 K. If the radius is reduced to half and temperature is doubled. find the power- radiated in watt.

A spherical blackbody of 12 cm radius used to emit 540 w thermal energy at 500 k temperature.. If the radius is halved and temperature is doubled then what will be the radiant energy?

A spherical blackbody of radius 12 cm at 5000 K temperature emits 540 watt thermal power. Find out the emitted power if its radius being half & temperature being doubled.

The power radiated by a black body is P and it radiates maximum energy at wavelength, lambda_(0) . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength (3)/(4)lambda_(0) , the power radiated by it becomes nP. The value of n is

The weight of a body on the earth's surface is W. if the radius of the earth becomes double keeping its mass unchanged, what will be the weight of the body ?

Two black bodies A and B have equal surface areas and are maintained at temperatures 27° C and 177° C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B ?