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A mechanical wave travels through a medium because a medium is necessary for the propagation of that wave. With a mechanical wave, like sound, mechanical energy is put intothe wave, and the medium carries the energy of the wave. This is in contrast to an electromagnetic wave (like light) which can move through a total vacuum.

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13y ago
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13y ago

It will bounce back.

reflection is the bouncing back of an object or wave when it hits a surface through wich it cannot pass.

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12y ago

They reflect back.

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Q: What happens when a wave hits a barrier it cannot pass through?
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