Spoon call. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Spoon chime. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Although we should be grateful to air for the fact that it gives us the opportunity to talk to each other, listen to good music, we still have to say that air is not the best conductor of sound. Sound is best conducted by solid bodies. After solids, liquids conduct sound well, and only in third place are gases.

Let's compare on a small experience how sound is conducted by air and an ordinary rope, in this case as a "representative" of solid bodies. Hang a tablespoon on two small strings and hit it on the table. You will hear a rather weak ringing. But if this ringing goes to your ears not through the air, but through the ropes on which the spoon hangs (for this you need to press the ends of the ropes to the auditory openings of the ears), you will hear a loud, bell-like ringing.

Now do the experiment by changing the spoons on the ropes. First, hang a large metal soup (draught) spoon and, hitting the edge of the table, listen to how it sounds. Then again, for comparison, listen to an ordinary tablespoon. And finally, listen to the teaspoon. In all three cases, the spoons sound differently: the lowest, bass tone was with a draft, large spoon, the sound of a tablespoon was a little higher, and the highest tone was with a small, teaspoon. The sound of the spoons depended on the frequency of their oscillations. The larger the spoon, the lower the frequency of its oscillations and, therefore, the sound is lower.

Spoon chime

If you manage to get a piece of dry ice, which is usually available from ice cream vendors, you can do an interesting experiment. Press a teaspoon against a piece of dry ice and you will hear a subtle howling sound. It will not last long, because the spoon, having cooled greatly, will stop sounding. It sounds because carbon dioxide is rapidly released at the point of contact between dry ice and a warm spoon. Escaping from under the spoon, it makes it vibrate at a high frequency, and we hear a sound.

Author: Rabiza F.V.

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