Physical knowledge contained in Aquarius

Have we paid attention to such a game: the glass bottle of different sizes is lined up in order, adding different volumes of water to different bottles, and then tapping with chopsticks or wooden sticks to make different sounds. To this end, the researchers proposed the concept of "Aquarius".

Before we understand Aquarius, let's do an interesting little experiment.

First, install different water in the eight glass bottles, and arrange it in the order of water level;

Secondly, adjust the water level in the bottle, knock, until the music rhythm of "1, 2, 3, 4, 5, 6, 7, i" is issued;

Finally, according to the music spectrum, a simple and beautiful song. This experimental object is called "Aquarius": adding water bottle with the same size of the size of the material or the glass, according to the amount of water volume, so that they form a complete sound. The sound of pleasing sounds while knocking, so it is also called the "water cup bell".

Why can Aquarius make different sounds?

First of all, in the above experiments, we will find that when the pounded bottle is more water and the air is low, the sound is low; on the contrary, the sound of water and air will become high, that is, the tone of the water bottle piano will be with The water and air in the bottle change.

Then, let's review a small physical knowledge: the higher the frequency of the vibration, the higher the tone, the lower the vibration, and the tone is low.

Therefore, Aquarius can make different sounds because Aquarius is equipped with different amounts of water, so that different water columns are formed. When knocking on the bottle with chopsticks, the vibration of the bottle is caused, but because the length of the water column in the bottle is different and the frequency of the vibration is different, the tone is also different.

In fact, no matter what kind of musical instrument or different performance methods, the principle of sound of all instruments is the same: the sound is made by vibration.

For example, the bell also sounds because of vibration. The clock body is small, the tone is high, and the volume is small; the bell is large, the tone is low, and the volume is also large. Moreover, the sound of the bell is also very rich. The piano is one octave, and the center sound range is complete. When the traditional bell performance is played, 4-5 people will usually perform at the same time to produce wonderful music.

This article is scientifically controlled by Liu Huan, a second -level teacher in Fenglin School in Weihai City, Shandong Province.

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