Problem 2 A string with both ends held fixed is Vibrating in its third harmonic. The waves have a speed of 192 In / s and a frequency of 240 Hz. The amplitude of the standing wave at an antinode is 0.400 cm. a) Find a general equation for the height of the string, y, at each point x and time t. b) Calculate the amplitude at points on the string a distance of 40.0 cm, 20.0 cm, and 10.0 cm from the left end of the string. c) At each point in part (b), how much time does it take the string to go from its largest upward displacement to its largest downward displacement