If you've ever been on a swing, you know how powerful the vibrations can be. Those vibrations are created by the movement of a person's eardrum. Scientists have started to investigate how these sounds can move things. These techniques are currently only available in labs. However, in the near future, we will start hearing about this technique in everyday life. But first, let's look at how sound works.
The simplest way to understand how sound vibrations can move objects is to think about the motion of a slinky. This is done by focusing on the shape of the slinky's coil rings. When the slinky is falling, it creates a compression wave, which moves the slinky upwards. When it hits the surface of a wall, the slinky remains stuck because of the pressure of the sound waves.
The same principle applies to sound waves. A vibrating object has a certain frequency, which is the same for all objects. Adding water will make glass heavier and produce a lower pitch. The frequency of a vibrating object tends to be a specific frequency. If a glass is heavier than another one, it will create a lower pitch than the lighter one. The same principle applies to liquids and gases.
The frequency of sound waves is the number of vibrations that an object produces per second. The frequency is measured in Hertz. It must be at a specific frequency to be effective. A sound wave that is at a high frequency can cause a certain amount of movement to happen. The researchers manipulated the speed of the objects by sending the waves in opposite directions. This is a great example of how sound can be used to move things.
In addition to moving things, sound waves can also move the molecules that surround them. This is called a "suspended particle." A suspended object will stay in one place by being compressed. The air will remain in its original position. In this way, it can move an object. It may not be possible to make this motion permanent, but the process is a step closer than we thought. This technology requires hundreds of tiny speakers, and isn't considered for home use.
If the sound is loud enough, it will move the objects. When the sound travels through air, it will be at 340 metres per second. Similarly, in solids, the sound will be higher in pitch in the distant object than in the one that is nearer. The distance traveled by a wave is different from its distance. But when it's far from the object, the sound will be lower.
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