Physics - Heat & Thermo Question with Solution | TestHub

When the centre of the Earth is at a distance of $1.5\times 10^{11}$ m from the centre of the Sun, the intensity of solar radiation reaching the Earth's surface is 1.26 kW $m^{-2}$. There is a spherical cloud of cosmic dust containing iron particles. The melting point for iron particles in the cloud is 2000 K. Find the distance of the iron particle from the centre of the Sun at which the iron particle starts melting. (Assume the Sun and the cloud as black bodies, $\sigma =5.8\times 10^{-8}$ W $m^{-2}$$K^{-4}$.)