Bell plates are polygonal-shaped flat pieces of sheet metal which, when held in the hand and struck with a beater, produce a pleasant, sustained, slightly bell-like tone. Compare this to any arbitrary shaped piece of metal which produces a...
Large speaker with signal generator/amplifier destroys a wineglass; stroboscopic illumination shows vibration mode.
Sound waves of the right frequency are used to excite a wineglass in one or two of its normal modes of vibration. Stroboscopic...
Standing sound waves in a glass pipe are made evident by the fountains of kerosene inside the pipe.
The air inside a very large glass pipe (partially filled with a fluid) is acoustically excited into a standing wave. Once resonating, the...
Accumulation of sand at nodes of vibrating plate reveals resonance patterns.
A Chladni plate consists of a flat sheet of metal, usually circular or square, mounted on a central stalk to a sturdy base. When the plate is oscillating in a...
Demonstrate musical intervals, the relation of pitch to frequency, and autocorrelation in psycho-acoustics.
A 25 cm diameter metal disk has a number of concentric rows of regularly spaced holes. When rotated at a uniform speed...
As a passive amplification device, the exponential horn is amazing. Using a "talking" greeting card as a feeble source of music, the intensity of the sound gets amplified by about 18 dB when the greeting card is coupled to the horn ... a...
A bell, ringing in a bell jar, ceases to be heard as the bell jar is evacuated.
Change pitch of organ pipes by changing sound velocity.
At a constant temperature, the speed of sound in a gas c, is dependant on the molecular weight of the medium
A high-pitched alarm on the end of a rope is whirled about the head.
Doppler shift of sound emitted by an object moving in a circular orbit, with the pitch clearly changing as the object move towards, away or perpendicular to the line of the...
