An electric heater supplies 12000 J to ice at its melting point. The collected meltwater has mass 0.050 kg. A control experiment shows that 0.010 kg would melt from energy supplied by the surroundings alone. What corrected value of specific latent heat is obtained? Use Q=mLQ=mLQ=mL.
3.0×105 J/kg3.0\times10^5\ \mathrm{J/kg}3.0×105 J/kg
1.2×106 J/kg1.2\times10^6\ \mathrm{J/kg}1.2×106 J/kg
2.4×105 J/kg2.4\times10^5\ \mathrm{J/kg}2.4×105 J/kg
2.0×105 J/kg2.0\times10^5\ \mathrm{J/kg}2.0×105 J/kg
110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.