Standing waves can be produced within an aluminum rod by holding the rod at its midpoint and stroking it with an alcohol-saturated paper towel. In this resonance mode, the middle of the rod is a node and the ends are antinodes, just like the first harmonic of an "open-open" system. What is the frequency of the resonance if the rod is 1.88 m long? Note that the sound waves travel back and forth inside the aluminum, not in the air, so use the velocity of sound in aluminum as 5100 m/s. Hz (± 20 Hz)
Added by Hugo V.
Close
Step 1
We know that the rod is in its first harmonic, which means it has a single wavelength along its length. Show more…
Show all steps
Your feedback will help us improve your experience
Madhur L and 99 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Resonance of sound waves can be produced within an aluminum rod by holding the rod at its midpoint and stroking it with an alcohol-saturated paper towel. In this resonance mode, the middle of the rod is a node while the ends are antinodes; no other nodes or antinodes are present. What is the frequency of the resonance if the rod is $1.00 \mathrm{~m}$ long?
A longitudinal standing wave can be created in a long, thin aluminum rod by stroking the rod with very dry fingers. This is often done as a physics demonstration, creating a high-pitched, very annoying whine. From a wave perspective, the standing wave is equivalent to a sound standing wave in an open-open tube. In particular, both ends of the rod are anti-nodes. What is the fundamental frequency of a 1.70 m -long aluminum rod? The speed of sound in aluminum is 6420 m/s.
Hubert A.
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD