1 演示声音在真空中不能传播 这个实验是师生特别喜爱的演示实验之一。过去人们选用支架或粘接法,在容器内悬挂能发出悦耳声音的物体(如小铃、金属夹、一串钥匙等),并且要注意支架及悬线不应给声音提供传播的途径。获得真空前,摇动容器,能听见小铃发出的声音,获得真空后,摇动容器则听不到声音。 1 The demonstration sound cannot be transmitted in a vacuum This experiment is one of the demonstration experiments that teachers and students are particularly fond of. In the past, people used brackets or adhesives to hung objects (such as small bells, metal clips, a bunch of keys, etc.) that could produce pleasing sounds inside the container, and care should be taken that the brackets and suspension lines should not provide a means for sound transmission. Before the vacuum is obtained, shake the container and you can hear the sound of the small bell. After the vacuum is obtained, the container is shaken and no sound is heard.