Answered

Explore Westonci.ca, the leading Q&A site where experts provide accurate and helpful answers to all your questions. Ask your questions and receive precise answers from experienced professionals across different disciplines. Connect with a community of professionals ready to provide precise solutions to your questions quickly and accurately.

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.
We hope our answers were useful. Return anytime for more information and answers to any other questions you have. We hope you found this helpful. Feel free to come back anytime for more accurate answers and updated information. Thank you for choosing Westonci.ca as your information source. We look forward to your next visit.