关于真空不能传声的实验,教材中是将发声的闹钟或电铃放在装有抽气设备的钟罩里来进行。实践证明,用闹钟或电铃做声源,抽气前后铃声的变化不明显,达不到满意的实验效果。为此我们对此实验做了改进。 With regard to experiments in which the vacuum cannot be transmitted, the sounding alarm clock or electric bell is placed in a bell jar equipped with a suction device. Practice has proved that using an alarm clock or an electric bell as a sound source, the change in the bell sound before and after pumping is not obvious, and satisfactory experimental results cannot be achieved. For this reason we have made improvements to this experiment.