棒、条和管子的振动频率,部分决定于其所用的材料,部分决定于其尺寸大小。材料弹性大,频率即较高;比重越大,频率越低。如把相同尺寸的铅、陶、锡、铜和铁的板条两端支起,铅条所发的音最低沉,此外,圆柱棒的频率随直径增大而升高;棱柱棒（如木琴的音条）随厚度的增加而 The frequency of vibrations of bars, bars and tubes depends, in part, on the material they are used in, and partly on their size. Material flexibility, the frequency is higher; the greater the proportion, the lower the frequency. Such as the same size of lead, pottery, tin, copper and iron at both ends of the support of the slab, lead bar issued the lowest sound, in addition, the diameter of the cylindrical rod increases with the increase; Prism rods (such as xylophone The sound note) with the thickness of the increase