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在高中物理课本上册第269页上所举的共振现象应用的例中说“许多弦乐器都装有共鸣箱(胡琴的琴筒、提琴的琴体等都是共鸣箱),利用共鸣箱中的空气柱跟琴弦共振,来增强乐器发出的声音”。其实,这是错误的说法。胡琴的琴筒,提琴的琴体里的空气柱只是在弦振动周期力的作用下,发生受迫振动。一定形状,体积和密度的空气柱的固有频率是一定的,而弦振动的频率是随着(可振动)弦的长短和其中张力大小变化而
In the example of the application of resonance phenomena cited on page 269 of the high school physics textbook, “Many stringed instruments are equipped with a resonance box (a harp’s harp, a harp’s body, etc. are all resonance boxes) The air column resonates with the strings to enhance the sound of the instrument ”. In fact, this is the wrong statement. Huqin piano, violin body of the air column is only the role of periodic vibration in the string under the force of forced vibration. The natural frequency of an air column of a certain shape, volume and density is constant, and the frequency of the string vibration varies with the length of the (oscillatable) chord and the magnitude of the tension therein