Two Children Setup a "Telephone" by Placing a Long, Slender

question 40

Multiple Choice

Two children setup a "telephone" by placing a long, slender aluminum (Y = 6.9 × 10¹⁰ N/m²) rod that has a length of 6.1-m between their two houses. To communicate, a child taps a coded message on one end. How long do the sound waves take to reach the other end? Note: the density of aluminum is 2700 kg/m³.

• A)1.2 × 10^-3 s
• B)2.4 × 10^-7 s
• C)8.0 × 10^-6 s
• D)6.3 × 10^-5 s
• E)1.1 × 10^-4 s

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