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如图所示,用有机玻璃做成一个方形容器,相邻两壁安装四个扬声器,扬声器在音频振荡器驱动下可发出声波。声波经方形容器壁反射,在各反射声波共同作用下,可使容器中间放置的旋转体不断旋转。为什么扬声器发出声波后,旋转体会旋转起来? 答:扬声器发出的声波与从对面器壁反射回来的声波要叠加。调节音频振荡器输出给扬声器的频率与电压,可以调节声波的波长与幅度,当满足驻波条件时,就在方形容
As shown in the figure, a square container is made of plexiglass, and four speakers are installed on two adjacent walls. The speaker can be driven by an audio oscillator to emit sound waves. The sound waves are reflected by the walls of the square container, and the rotating bodies placed in the middle of the container are continuously rotated under the influence of the reflected sound waves. Why does the rotating body rotate after the speaker emits sound waves? A: The sound waves emitted by the speaker are superimposed on the sound waves reflected from the opposite wall. Adjusting the frequency and voltage of the audio oscillator output to the speaker can adjust the wavelength and amplitude of the sound wave. When the standing wave condition is satisfied, it is in the square capacity.