Put the conch on your ear and you can indeed hear the "sound of the sea", amazing!
How is the sound produced? It is estimated that everyone knows: the vibration of objects. Because I learned it in elementary school science class.
Bob: My science class was occupied by english
Xiaohong: There is also music, art, sports...
Teacher Of Words: ...
But how this law came to be, there is a lot of article. If an object is vibrating when it makes a sound, can we conclude that the sound is generated by the vibration of the object? Of course not.
If the object is rotating at the same time, it may also be caused by rotation; if the object is in the hands of the person, it may also be related to the hand; even if the person next to it is chanting a mantra, it may also be caused by the mantra...
How exactly does the ringtone come about?
Based on just one phenomenon, we cannot conclude that "sound is produced by the vibration of an object", so we need to make a lot of observations: as long as the object is making a sound, we will look at it.
Observe the characteristics of the string when it makes a sound
Can't see clearly, just get started:
Feel the characteristics of the laryngeal part when speaking
After a lot of observation, we found that the objects that are making sounds are vibrating without exception, so we initially concluded that sound is generated by the vibration of objects. This method of analysis is called induction. The object that is making sound is called the sound source.
Bob: My cat loves fish
Xiaohong: My cat also loves to eat fish
Daming: Coincidentally, my cat also loves to eat fish
Big Red: Qiao's mother opened the door to Qiao, Qiao arrived home, and my cat also loves to eat fish
……
Inductive conclusion: Cats love to eat fish
We hear a sound that we have not heard before, according to our theory that "sound is produced by the vibration of an object", and we believe that this "previously unheard sound" is also generated by the vibration of the object, so we can also find the corresponding sound source. That's the deduction.
If the deduction is successful, our conclusions can be further verified. If the deduction is not successful, and we find an object that can make a sound without vibration (find a cat that does not like to eat fish), it will overturn our conclusions.
Cat: I don't eat, I just play
Come and go, let's interpret:
Melodious flute sound, what vibrations are generated?
Melodious flute sound, what vibration is generated?
When the balloon is pierced, it makes a "boo" sound, what vibration is generated?
The sound of a balloon exploding, what vibrations are generated?
And at the beginning of the article, "The Sound of the Sea", what vibrations are generated?
Sometimes, the vibration of the object is not very obvious, and it is more difficult to observe. At this time, we can convert the tiny vibrations of the sound source into more obvious phenomena for easy observation.
For example, insert a taped tuning fork into the water:
The tuning fork stirs up a splash
Another example is to put some non-Newtonian fluids on the speakers (batter is enough):
Magical batter
Summary of knowledge
Consolidate exercises
Epilogue:
Various wind instruments (including flutes, etc.) are made by air vibrations, and the bursting sound of balloons is also emitted by air vibrations. Listening to the sound of the sea with a conch is formed after the sound of the surrounding environment is continuously emitted and amplified in the conch. In fact, we can hear the "sound of the sea" by using a bowl buckle near our ears, or simply by using our hands.
Reference Answer:
Example 21: Bounced off; sound is generated by the vibration of an object. Example Question 22:a.
Class!!!