It takes 20 minutes to melt 10 g of ice, when ray from the sun are focused by a lens of diameter 5 cm on to a block of ice. Calcualate the heat received from the sun of `1cm^(2)` per minute.
(Given, L = 80 kcal/kg)

The rays of the sun are focused on a piece of ice through a lens of diameter 5 cm , as a result of which 10g ice melts in 10 minutes. The amount of heat received from the sun per unit area per minute is

The rays of the sun are focused on a piece of ice through a lens of diameter 5 cm , as a result of which 10g ice melts in 10 minutes. The amount of heat received from the sun per unit area per minute is

Rays from the sun ar focuseed by a lens of diameter 5 cm on to a block of ice and 10 g of ice is melted in 20 min. Therefore the heat from the sun reaching the earth per min per square centrimetre is (Latent heat of ice L = 80 cal g^(-1) )

Rays from the sun ar focuseed by a lens of diameter 5 cm on to a block of ice and 10 g of ice is melted in 20 min. Therefore the heat from the sun reaching the earth per min per square centrimetre is (Latent heat of ice L = 80 cal g^(-1) )

At the given point of time, the earth receives energy from sun at 4 cal cm^(-2) mi n^(-1) .Determine the number of photons received on the surface of the Earth per cm^(2) per minute. (Given : Mean wavelength of sun light = 5500 Å )