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"The Propagation of Sound" Various Sound PPT Courseware 5
propagation of sound
When the alarm clock rings, how does the ringtone reach your ears?
Use a trumpet and a candle to demonstrate how sound travels through the air.
When the sound source is not vibrating, the surrounding air is not vibrating either.
When the sound source vibrates, the surrounding air also vibrates. The vibration of the surrounding air can be seen through the candle flame.
When the sound source vibrates, it will cause the surrounding air to vibrate. This vibration will spread through the air, and the sound will be transmitted to a distant place.
The above experiment shows that sound can travel through the air.
Sound can travel in air, but not in a vacuum.
Then guess what: Can sound propagate in liquids and solids?
Experimental investigation: Can liquids transmit sound?
Set the alarm clock to sound after 1 minute → Put it in a plastic bag → Put it into the water → Put the water pipe into the water → Do you hear the alarm sound?
Can liquids transmit sound? ----Demo
in conclusion:
----Sound can also travel in liquids (such as water).
Knowledge application:
1: Can we speak loudly when we are fishing? Why?
2: How do fishermen use electronic music nets to catch fish? (see the picture).
Can solids transmit sound? --Student groups
in conclusion:
----Sound can also propagate in solid objects (such as desktops).
Application of knowledge:
1: Musician Beethoven became deaf in his later years and used an iron rod to "listen" to music.
2: Dogs often lie on the ground when resting, put one ear on the ground, and listen to sounds from far away.
The propagation of sound requires a medium
Experiments show that sound must pass through a certain substance (such as air) to spread. That is, sound propagates through media.
The material that propagates sound is called the medium of sound
A vacuum cannot carry sound.
Not only air (gas) can transmit sound, but other substances such as water (liquid) and glass (solid) can also transmit sound.
Sound is transmitted in the form of waves through objects. When sound waves encounter an object, it causes the object to vibrate. This is how sound spreads from one place to another through various materials.
Class Exercise 1: Fill in the blanks
As shown in Figure 3-1-5, Figure A shows a person beating the drum, which can produce a pleasant drum sound, which shows that the sound is produced by the object _______; Figure B shows that the air in the glass cover is removed, and the sound cannot be heard. to ringtones, indicating that the transmission of sound relies on _______.
Why can a water ballet dancer still dance to the music when her head is submerged in the swimming pool?
Water is the medium.
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