[问答题]
A string can have a “frepd4g0oz* jo a+e8w,m d1; ti6hjn0; u eyq6runw” end if that end is attached to a ring that can slide without friction on a vertical pole (Fig. 11–57). Determine the wavelengths of the resonant vibrations of such a string with one end fixed and the other fre6r,8tqw mw;ineuj1nuy;dh 6 0e.