Einstein
Temporal Engineer
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A standing wave is generated by having two waves of the same type and frequency moving toward each other. That way the velocity cancels. That is why it is called a standing wave. Because it doesn't move.
A standing sound wave has high energy and low energy zones. The salt shown in the video migrates toward the low energy zones. That makes the salt become trapped in a ring formation. All that ring shows is the low energy portion of the standing sound wave.
In the video as the frequency of the sound increases, more rings appear. The sound wave originates at the center of the metal plate and bounces off the edge of the plate, thus making the opposite traveling sound wave. At specific wavelengths that are whole number divisions of the radius of the plate, low energy ring patterns are produced.
There is no magnetism present. Although you could use magnetic waves to produce standing waves too.
A standing sound wave has high energy and low energy zones. The salt shown in the video migrates toward the low energy zones. That makes the salt become trapped in a ring formation. All that ring shows is the low energy portion of the standing sound wave.
In the video as the frequency of the sound increases, more rings appear. The sound wave originates at the center of the metal plate and bounces off the edge of the plate, thus making the opposite traveling sound wave. At specific wavelengths that are whole number divisions of the radius of the plate, low energy ring patterns are produced.
There is no magnetism present. Although you could use magnetic waves to produce standing waves too.