Question

acoustic cell phone amplifier quiz - based on \sound\ re
sound medium is a substance through which sound travels (air, water, metal, wood, and many other substances )
true
false

Explanation:

Sound needs a medium to travel. Examples like air (gas), water (liquid), metal and wood (solids) are all substances through which sound can travel. So the definition of sound medium as a substance through which sound travels is correct.

Answer:

True