[问答题]
A string can have a b 8kf4fv9hct(8uf r g8 un. 9f9qwcrdf; y0(ww“frgxey-l7dm- *vee” 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-xvy7-g lmed* other free.
