Sound has three elements of sound.
(1)Sound size
(2)Sound height
(3)Sound tone


For example, I shook strings as shown in the above figure.

(1)Sound size

→　It is determined by amplitude of the sound.
Amplitude is the fluctuation amplitude of the sound source. In order to produce a loud sound, it is necessary to increase the amplitude by repelling the string strongly.

(2)Sound height

→　It is determined by the sound frequency .
Frequency is the number of times the sound source vibrates per second. The unit is Hertz.【Hz】If it makes 4 round trips per second, it becomes 4 Hz. In other words, we will send out 4 waves per second. In order to produce a high sound, increase the force to pull the string, thin the string, shorten the vibration part of the string and increase the frequency.


Also, a person recognizes a sound with a large frequency as a high sound and a sound with a low frequency as a low sound.
For example, the frequency of the sound of the middle do of the piano keyboard is ... 261.6.
Looking at the table, you can see that the higher the sound = the higher the frequency.

Plusα

For example, sounds in the range that can be heard by the human ear of a piano are called audible sound , and it seems that it sounds like 20 Hz to 20000 Hz. When it exceeds the audible sound, that sound is called supersonic waves . ※For more information, Relationship between sound and human body I will explain it in
There are various experiments to check the height of the sound so please try it! (Example: Placing in a test tube or a water bottle Change the height of the water and blow the mouth ...?)

(3)Sound tone

→　It is determined by the waveform of the sound. Even if it is the sound of the same height or the sound of the same frequency, the instrument sounds different depending on the type. Even humans, it is boring if everyone is the same voice isn't it...?