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取一只扬声器、装在一只硬纸盒内,在纸盒的面板上钻一个直径约为2～3mm 的小孔,将扬声器通过一只耳塞插头插入收录机的输出插孔中,演示时、在纸盒小孔的前方放一支生日腊烛,且使小孔对准蜡引线的上端,点燃蜡烛,(?)后播放音乐,可以在听声音的同时肴到烛焰(?)飘动,停止播放,声音消失。烛焰即竖直向上,(?)此可以说明声源的振动将引起周围空气振动.
Take a speaker, install it in a cardboard box, drill a small hole about 2~3mm in diameter on the panel of the paper box, and insert the speaker through an earplug plug into the output jack of the recorder. Put a birthday wax candle in front of the hole in the carton, and make the hole at the upper end of the wax lead, light the candle, and play the music after (?), you can listen to the sound while flickering to the candle flame (?), Stop playing and the sound disappears. The candle flame is vertically upward, (?) This can indicate that the vibration of the sound source will cause the surrounding air to vibrate.