1真空不能传声(1)装置图(见图1)(2)制作方法一①将一部手机悬挂在广口瓶内,拨打手机,手机发出铃声,同时屏幕发光,这时我们能够听见瓶中手机的铃声(图1a)。图1②用抽气机将瓶中的空气向外抽出,随着瓶中空气减少,手机铃声逐渐变小,最后几乎听不见声音了。③拔下抽气管,“嗤!”空 1 The vacuum cannot be transmitted (1) Device diagram (see figure 1) (2) Method 1 Hang a mobile phone in a wide-mouth bottle, dial the mobile phone, and the mobile phone emits a ringing tone. At the same time, the screen emits light. At this time we can hear the bottle. Ringtones in mobile phones (Figure 1a). Figure 12 uses an air extractor to pump the air out of the bottle. As the air in the bottle is reduced, the phone’s ringing tone gradually becomes smaller and the sound is almost inaudible. 3Unplug the exhaust pipe, “Hey!” Empty