A long tube, fitted with a tap, is filled with water. A tuning fork is sounded above the top of the tube as the water is allowed to run out of the tube, as shown in figure 4 below tuning fork 512Hz 32.4 cm Figure 4 Figure 5 A loud sound is first heard when the water level is as shown in figure 4, and then again when the water level is as shown in figure 5 Figure 4 illustrates the standing wave produced in the tube. a) On figure 5, i. sketch the form of the standing wave produced in the tube, i. mark, with the letter N, the positions of any nodes of the standing wave b) The frequency of the tuning fork is 512 Hz and the difference in the height of the water level for the two positions where a loud sound is heard is 32.4 cm Calculate the speed of sound in the tube 13)