Hygrometer (KEIH is used to measure the relative humidity of air. It consists of two identical thermometers called wet bulb and dry bulb as shown. beaker of water (a) Which thermometer will give a lower reading? Briey explain. (b) The difference between the two thermometer readings tells the relative humidity of air. Does a high humidity result in a small or large difference of readings? Briey explain. 8. Arnold heats a substance X from a solid to a gas. The temperature T of X changes with time t as shown. T/ C 160 120 80 - 40 0 20 40 60 80 t / min (a) Find the melting point and boiling point of X. (b) In which period can he find X in liquid state? (c) Arnold comments that (1) X absorbs latent heat of fusion from t = 0 to t = 8 min to melt (2) the internal enegy of X keeps constant from t = 50 to t = 94 min Do you agree? Why?10. Mary is cooking potatoes with boiling water. She thinks that 'the potato can be cooked faster if the water boils more vigorously.' Do you agree? Why