| ppefmh | Ed | Garstin | 1/2 | Unlike light waves, sound waves need a medium to travel through. |
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Sound moves move by particles vibrating. This means that sound waves require a medium to travel through and cannot travel through a vacuum (a vacuum contains no particles).
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Sound moves move by particles not vibrating. This means that sound waves require a medium to travel through and cannot travel through a vacuum (a vacuum contains no particles).
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Sound moves move by particles vibrating. This means that sound waves do not require a medium to travel through and can travel through a vacuum (a vacuum contains no particles).
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A reflected sound wave is called an echo.
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A reflected sound wave is called an clap.
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A reflected sound wave is called an normal.
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