Answered

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A brass rod is encased in aluminum. What happens to the speed of a sound wave when it moves from the aluminum into the brass?

\begin{tabular}{|l|c|c|c|c|}
\hline & Aluminum & \begin{tabular}{c}
Brass \\
[tex]$(70 \% Cu$[/tex], \\
[tex]$30 \% Zn )$[/tex]
\end{tabular} & Copper & Lead \\
\hline \begin{tabular}{c}
Speed of \\
sound \\
(m/s)
\end{tabular} & 6,420 & 4,700 & 5,010 & 1,960 \\
\hline
\end{tabular}

A. It increases.
B. It falls to zero.
C. It stays the same.
D. It decreases.

Sagot :

GinnyAnswer
To determine what happens to the speed of a sound wave when it moves from aluminum to brass, let's consider the provided speeds of sound for both materials:

1. Speed of sound in Aluminum (Al): 6,420 m/s
2. Speed of sound in Brass (70% Cu, 30% Zn): 4,700 m/s

We need to compare these speeds to understand the change in speed of the sound wave as it transitions from aluminum to brass.

- In aluminum, the speed of sound is 6,420 m/s.
- In brass, the speed of sound decreases to 4,700 m/s.

To summarize, when the sound wave moves from aluminum to brass, the speed changes from 6,420 m/s to 4,700 m/s. Since 4,700 m/s is less than 6,420 m/s, the speed of sound decreases.

Therefore, the correct answer is:
D. It decreases.
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