In discussing the blackbody radiation we have introduced two quantities, the spectral radiancy RT(V) where RT(v)dV represents the energy radiated per unit area and unit time by a blackbody, in the frequency interval v and v-l-dv, and energy density pv), where pT(v)dV represent the energy density per unit volume of the blackbody radiation. It can be shown that these two quantities are related by RT(V)=(c/4) pv), where c is the speed of light [check the dimensional relation is correct]. A cavity radiator at a temperature of 6000 K has a hole of 10.0 mm diameter. Assuming that the hole does not affect the wave inside the cavity, nd the power radiated through the hole in the wavelength range 5500-5510 A