electromagnetic waves, Do not require a medium and can travel through a vacuum, mechanical waves, Require a medium (solid, liquid, or gas) to travel, longitudinal waves, The particles of the medium move parallel to the direction of wave propagation, Audible sound, 20 Hz to 20,000 Hz (what humans can hear)

Waves

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？