Resonance
How periodic forces produce large-amplitude vibrations
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Standing wave created by reflection
School blocks YouTube?
Resonance W.F.U.
Kieff, Ptj, Wikipedia, public domain
C. Resonance – Building up of energy by adding small amounts of energy in time with the natural frequency of an object
If you rock back and forth
Resonance Frequency – natural frequency that an object vibrates when disturbed
Can an opera singer really break a wine glass?
Sound Pulverizing Kidney Stones
Resonance in slow motion
Sound breaking a wine glass
Salford University
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The Physics
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How does this demonstrate resonance?
Enrichment
Resonance
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. Resonance is best described as
2. An object's resonant frequency is
3. To make a playground swing go higher and higher, you should push
4. How can an opera singer shatter a wine glass with her voice?
5. Two identical tuning forks face each other. One is struck, and the other starts to vibrate. Why?
Shattering a Wine Glass With Sound
When you tap a wine glass, it rings at its natural frequency of 520 Hz. A loudspeaker aimed at the glass plays a loud tone, and the frequency is slowly increased from 400 Hz to 600 Hz.
At what frequency is the glass most likely to vibrate with the greatest amplitude and possibly shatter?
▶ Want a challenge? Open 6 more Regents-style questions (harder · mixed formats)
Challenge score: 0 / 6
C1. Two identical tuning forks sit on a table. One is struck. Why does the other begin to vibrate?
C2. A student makes the following claim.
Place a check mark in either the Support or Refute box. Justify your response.
C3. The speed of sound in the room is 340 m/s. Substitute numerical values into a mathematical representation that can be used to determine the wavelength of the sound that shatters the glass. Then calculate the wavelength.
C4. Place a check mark in three boxes to indicate the examples of resonance.
C5. In 1940, the Tacoma Narrows Bridge collapsed when wind made it oscillate with increasing amplitude. How do modern engineers reduce this risk?
C6. Describe how energy builds up in the glass while the speaker plays 520 Hz, and identify one way to keep the glass from shattering while the speaker still plays the same 520-Hz tone.