[填空题]
A violin string vibrates at 294 Hz when unfingered. At what fkmose 9u4b2my m, e+ 1tuks+k9requency will wlhyw(6o 9 s( 6yf)ecsit vibrate if it is fingered one-third of the way down from the end? (That is, only two-thirds of the string vibrates 6 (9shleyo ysw)6wcf(as a standing wave.) Hz
