Question

question 23 of 25
based on the data in the table, what will happen when a sound wave travels from aluminum into copper?

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

Explanation:

Step1: Compare the speeds

Compare the speed of sound in aluminum ($6420$ m/s) and in copper ($5010$ m/s).
Since $6420>5010$.

Step2: Analyze the effect

When a sound wave travels from a medium (aluminum) where it has a higher speed to a medium (copper) where it has a lower speed, it slows down.
Frequency of a sound wave remains constant when it travels from one medium to another. And there is no indication of complete absorption from the given data (as speed in copper is non - zero).

Answer:

B. The wave will slow down.