Question

based on the data in the table, what will happen when a sound wave travels from aluminum into copper?

	aluminum	brass (70% cu, 30% zn)	copper	lead

a. the wave will change in frequency.
b. the wave will speed up.
c. the wave will slow down.
d. the wave will get completely absorbed.

Explanation:

Step1: Compare sound - wave speeds

The speed of sound in aluminum is 6420 m/s and in copper is 5010 m/s.

Step2: Determine the change

Since 5010 m/s < 6420 m/s, the sound - wave speed decreases when moving from aluminum to copper.

Answer:

C. The wave will slow down.