Guys I'm weak in heat and kinetic theory, so I'm gonna need extra guide and pointers from you guys to solve this and the coming questions. Thank you. Question: A pond of water at 0 degrees Celsius is freezing. The thickness of the ice layer is h and the top surface of the ice remains at a temperature θ (θ being < 0°C). (i) Derive an equation for the rate of increase of h in terms of θ, l, h, λ, and ρ, where l is the specific latent heat of fusion, λ is the thermal conductivity and ρ is the density of ice. (ii) Discuss how the rate of formation of ice would be affected if the temperature of the water in the pond was 0°C at the water-ice interface but increased with depth to 4°C at the bottom of the pond. [Specific latent heat of fusion of ice, l = 3.3E5 J/kg; thermal conductivity of ice, λ = 2.3 W /mK; density of ice, ρ = 920 kg/m^3] Attempt: None? I don't think I learned thermal conductivity in CIE A Level (I couldn't find it in the syllabus list either), and I'm currently googling for more info on it. Pointers anyone? Thank you!