Points to note when purchasing products : The rubber duck in the video is not included in the components. We hope that there is no error when purchasing.
-------Refer to the comment during class^^--------
Have you ever thought about how the rubber duck beeps ?
There is an unusual principle hidden in the cute rubber duck beep that I played with inadvertently !
When air passes between objects, it vibrates and makes a sound.
If this right is strong wind blowing trees or Power lines fell that day, the hum Mom's baby Put your mouth on a boat-part bulttae will sound like a fart in the skin along with the laughter of itching najiyo Oh! The sound of farts is also the sound of the air passing through it ㅋㅋㅋㅋㅋ (the smell comes out as a service ㅋㅋㅋㅋ)
You can hear the smellless fart sound when you blow it with your mouth on the back of your hand ^^
In the past, there was a lot of clean grass around, so we used the grass in our mouth and blown it like a flute. This is also the principle of wind instruments.
You can play a paper flute instead of a grass flute! Put two sheets of paper on your lips and blow them so that you can make a sound. Blowing hard doesn't make a sound.
When holding the paper, hold it close and hold it wide, hold the paper loose, pull it tight, and blow it to make a high sound and a low sound.
Now you know how the flute sounds? That air causes vibration!