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In physics, sound is a vibration that propagates as a typically audible mechanical wave of pressure and displacement, through a transmission medium such as air or water. In physiology and psychology, sound is the reception of such waves and their perception by the brain. Humans can hear sound waves with frequencies between about 20 Hz and 20 kHz. Sound above 20 kHz is ultrasound and below 20 Hz is infrasound. Other animals have different hearing ranges.

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More sound experiments that will revolutionize engineering and music forever. (And they all utilize similar concepts from my previous posted videos)

Contributed by Michael Villalpando

This experiment is simple to do and cool to look at. By placing a thin rubbery membrane over a speaker and attaching a mirror to that membrane-speaker combo, you can shine a laser at the mirror as it plays to change the pattern of the laser. By varying the frequencies, the laser will ultimately show you the complexity of a sine wave

Contributed by Michael Villalpando

A cool experiment that uses a wave driver and various frequencies to move sand into cool patterns. The sand pattern essentially show nodes and anti-nodes, where the nodes are the areas in which have no sand (vibrating) and the anti-nodes with sand (not vibrating). All-in-all, cool to watch, terrible to listen to.

Contributed by Michael Villalpando

This speaker is great for pranks because it utilizes many smaller speakers within it to intentionally cause interference with each other. Using ultrasound, the many speakers within the larger one, interfere with each other and force the air around it to generate sound in a straight line making it only able to be heard when standing in front of it!

Contributed by Michael Villalpando

This Kundt's tube experiment utilizes differing frequencies in order to generate high and low pressure fields within the closed tube. Each frequency, when set at a specific amplitude, raises the styrofoam balls and shows the viewer the nodes and anti-nodes (or vibrating and non-vibrating areas) of the sine waves.

Contributed by Michael Villalpando

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