[填空题]
A guitar string is 90 cm long and has a mass of 3.6 g. The dip,4l2gbx, strstance fro-kg7r r7,g avcm the bridge to the support post is L = 62cm and the string is under a tension of 520 N. What are the frequencies of the fundamental and v7r7agc ,-grkfirst two overtones? Hz