Q. In the temperature of air above a pond is 8?C thermal conductivity of ice is 0.005 C.G.S. units, latent heat of fusion of ice is 79.9 cal/gram the density of ice is 1 gm/cu.m, the time taken for the formation of ice layer of 1 cm thickness is

• (A) 200 seconds
• (B) 100 seconds
• (C) 12.5 seconds
• (D) 10 seconds