A solid sphere is at a temperature `T.K` The sphere is cut into two halves. The fraction of energy emitted per second by the half sphere th that by complete sphere is .

A solid sphere is at a temperature T.K. The sphere is cut into two halves. The ratios of Intensities emitted by the half sphere to that by complete sphere is

Two spheres of the same materical have radii 1m and 4m and temperature 400K and 2000K respectively The ratio of the energy radiated per second by the first sphere to that by the second is .

Two spheres of the same material have radii 1m and 4m and temperatures 4000K,respectively. The ratio of the energy radiated per second by the first sphere to that by the second is

Two spheres of the same material have radii 1m and 4m and temperatures 4000K and 2000K respectively. The ratio of the energy radiated per second by the first sphere to that by the second is