Sagot :
Answer:
A. Medium
Explanation:
Sound is a sequence of waves of pressure which propagates through compressible media such as air or water. (Sound can propagate through solids as well, but there are additional modes of propagation). During their propagation, waves can be reflected, refracted, or attentuated by the medium.
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Answer:
Sound needs a medium material.
Explanation:
Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.