Thermal Properties of Matter - Calorimetry Question with Solution | TestHub

Earth receives $1400{\mathrm{Wm}}^{-2}$ of solar power. If all the solar energy falling on a lens of area $0.2{\mathrm{m}}^2$ is focused on to a block of ice of mass 280 g (at 0°C), the time taken to melt the ice will be (Take latent heat of fusion of ice $=3.3\times 10^5{\mathrm{Jkg}}^{-1}$ )