Resonance Apparatus
Resonance Apparatus
Demonstrating standing waves
The Resonance Apparatus allows to observe the resonance phenomena and to measure the speed of sound in air by exploiting standing wave and resonance effects in longitudinal waves.
Equipment needed
Tuning forks – Code 4317.90
Laws and principles investigated
experiment: Resonance phenomena - How to determine visually the wavelength of a standing wave
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This apparatus allows us to introduce the concepts and the main features of the resonance.
By raising or lowering the water-filled bulb, the length of the air column in the tube can be adjusted to correspond to the wave-length of the sound source placed near the mouth of the tube.
Air in a tube can be regarded as an oscillating system with its own vibration frequencies.
When an exciting frequency is equal to one of the apparatus, stationary waves can be observed in the oscillating air cylinder.
An audible sound is detected because the vibrating air volume is now larger than the volume excited by the tuning fork.
For a sound of given frequency, the tube length has to be a multiple of a quarter of the wave-length of the incoming wave, which is the shortest size a standing wave can form.
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