CAPE Physics Unit 1 · 2008 · Paper 2 · Question 4(c)

When a liquid is boiled using an electrical heater, the mass of liquid evaporated, m, is related to the power of the heater, P, and the elapsed time, t, by the equation Pt = mL. The specific latent heat, L, may be determined if the other quantities are measured. Table 2 shows the results of such an experiment.

Use this data to find the specific latent heat of the liquid, together with its uncertainty, and write the answer in the form L = (x ± y) x 10⁶ J kg⁻¹, using an appropriate number of significant figures.

This question uses a figure or table from the paper — you'll see it when you practise.