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

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排行榜

視覺風格

選項

切換範本

恢復自動保存: ?