[问答题]
A string can have a “free” end if that):l51hrt4 rvmdz* x ih -bsfm. end is attachedommt-gz:ahlu,xrw i7:,- q chg + p9d3 to a ring that can slide without friction on a vertical pole (Fig. 11–57). Determine the wavelengths of the:mi-hgo t73mgq-wx +r 9cdz u,la:,ph resonant vibrations of such a string with one end fixed and the other free.
