A string is fixed at both ends. The mass of the string is 0.0010 kg and the length is 4.3 m. The string is under a tension of 235 N. The string is driven by a variable frequency source to produce standing waves on the string. Find the wavelengths and frequencies of the first four modes of standing waves. a. A = f1 = b. X f2 c. 3 f3 d. 4 f4 = = = = = m Hz Hz Hz NE NE NE N m m = Hz