Home Acoustic Experiment / Experiments with Sound
Propagation of high frequency vibrations
What would our life be without the sound? It is, without a doubt, the most used sense after sight. And today it is the turn of making home experiments with him.
As you can see, it is a very simple physics experiment, but the results allow us to leave more than evidence as it propagates in the middle. Without a doubt, it is an excellent complement to the already published experiment, which we call: "Experiments with sound / sound propagation".
Materials:
* Two crystal glasses.
* Two matches (also known as matches).
Process:
Put the two crystal cups together, but without touching them. On one of them, place two matches, as shown in the image.
Now dip the yolk of your index finger, and begin to go over the edge of the other cup. It varies the pressure you make, and the speed, until you hear a buzzing sound. You will notice because it is very annoying :). You will see how the matches begin to move as if by magic, without anything or anyone touching them.
Home Experiment on Sound
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¿How does it work?
When we rub the edge of the cup, we can make it vibrate at a high frequency. We can listen to it, because this frequency is within the audible range (that does not mean that if we do not hear it, a body can not be vibrating)
The cup vibrating transmits this high frequency movement to the air, just by that means it reaches our ears. As we saw, the sound is transmitted in this medium (air) by rapid changes in pressure of the same. So we already know that the vibration of an object can be transmitted through the air (as well as other fluids).
But why do the matches move? Simple. Just as those changes in air pressure make our eardrum vibrate (so that it transforms it into an electrical signal and our brain interprets it as a sound) they also make the glass vibrate. This induced vibration makes the coefficient of friction between the matches and the cup go from static to dynamic. This, added to the (imperceptible) movements of the cup, results in the matches starting to move.
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