JAMB Physics 2022 Paper

Concept:Energy absorbed during melting at constant temperature is latent heat of fusion.Explanation:When ice changes to water, its temperature remains at $0^\circ\text{C}$.The heat needed for the phase change is given by $Q = mL_f$, where $m$ is the mass and $L_f$ is the specific latent heat of fusion.For $m = 1\,\text{kg}$, the required energy is $Q = L_f$.So the energy needed per kilogram of ice without a change in temperature is the specific latent heat of fusion of ice.Answer:A. specific latent heat of fusion of ice