Analyzing acoustics
1986/08/01 Aizpurua Sarasola, Joxerra Iturria: Elhuyar aldizkaria
Attach a silver spoon or any metal with a thread (in the center of the thread) and put each end of the thread into an ear while the spoon hits the table. You will surely hear collisions. Moreover, the sound of shock is so violent that it looks like the cathedral bell. What do you want to demonstrate with this essay? Not only in the air, but also in other means.
You've ever heard something with the rope phone. We will unite. Put in the bottom of two tin cylinders a circular piece of cardboard. If you then fit the two cartons with a 15-20 m long silk rope, the lanyard phone will be formed. While one speaks for a cylinder, the other must place the ear on the other.
To become aware of the speed of sound I will not propose any rehearsal, I will only mention some normal events. After lightning, thunder is not heard abruptly, but a few seconds. The same happens when a hunter far enough shoots. The sound of the shot does not match the smoke where we are. You will notice that the sound wave has a certain speed. If it is greater or lesser than light, we leave it in your hands.
As a culmination to this article we will create sounds of different level on the home table. Put seven equal glasses on the table, but the amount of liquid in each is different. If you are a competent musician, it will not cost you too much to hit the glasses with a spoon, surprise yours.
