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Amplitude, wavelength and frequency

Good revision for waves covering amplitude, wavelength and frequency.

http://bbc.in/Xe00N7

Missing Fundamental Effect

Information on fundamental frequencies in relation to music.

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/subton.html#c2

Ultrasonic Sound

Talks about the use of ultrasound, sound at frequencies above audible.

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/usound.html#c1

Resonances of open air columns

Pictorial description of waves in pipes. Includes ability to input information and obtain frequencies. Shows applications in musical instruments.

http://hyperphysics.phy-astr.gsu.edu/hbase/waves/opecol.html

Explorescience: Driven Harmonic Motion (1 mass)

Apply a driving force to a mass between two springs. This activity helps you understand natural and resonant frequencies. Subscription site but with 30 day free trial.

http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=20

Explorescience: Driven Harmonic Motion (2 masses)

Apply a driving force to two masses and three springs. Vary masses, spring constants and frequencies & observe different modes of resonance. Subscription site but with 30 day free trial.