The sound will have to slow down when it moves from aluminum into copper.
What is sound?
Sound is a form of energy that produces a sensation in the ear. Sound can not be seen but its effect can be felt. The chart shows the speed of sound through various media.
Looking at the chart we can see that the speed of sound in aluminum is greater than the speed of sound in copper hence the sound will have to slow down when it moves from aluminum into copper.
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