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Authoritative PPT Summary
"The Utilization of Sound" Sound Phenomenon PPT Courseware 8
Import new lesson
Sound: The concept is relatively broad, including sound, ultrasound, infrasound, etc.;
Sound: The concept is relatively narrow and only refers to the part of sound that can be felt by the human ear.
1. Sound conveys information
1. Obtain information from abnormal sounds
Doctor diagnoses disease through stethoscope;
The car mechanic listens to the sound of the car engine to determine the fault;
Railway workers hit the rails with hammers and discovered loose bolts from the unusual sounds.
2. Sound and energy
Can sound waves transfer energy?
What are some examples of using sound waves to transfer energy?
Surgeons use ultrasonic waves to deliver energy to remove stones from the human body. Ultrasonic atomization. Ultrasonic waves clean tartar.
Workers use ultrasonic waves to transfer energy to clean precision machinery such as clocks.
Small ultrasonic cleaning machine
Purpose of use: cleaning, degassing, disinfection, emulsification, mixing, replacement, and extraction of objects.
Usage departments: industrial and mining enterprises, laboratories of scientific research units in colleges and universities; hospitals; electronic workshop assembly lines; watch and eyewear stores, jewelry stores; families.
Cleaning items: electronic products, mechanical hardware accessories, glasses, jewelry, watches, coins, fruits, etc.
Summary
1. Sound can convey information.
(1) Echolocation: Sonar: It can detect the depth of the ocean and obtain information about fish schools in the water, etc.
(2) Use ultrasound to obtain information about internal diseases in the human body: B-ultrasound.
2. Sound can spread energy.
(1) Use the strong vibration caused by ultrasonic waves in the liquid to clean delicate machinery such as watches.
(2) Surgeons use ultrasonic vibration to remove stones from the human body.
Do it
1. When railway workers hit the rails with a hammer, they will find loose bolts from the abnormal sound, which shows that _______ can be obtained through sound.
2. Bats can use echo to determine ______. This method is called ______. Scientists used this principle to invent ______.
3. Place two identical tuning forks side by side (without contact), with the ping pong ball leaning against tuning fork B. When tuning fork A is struck, you will find that the ping pong ball ______, which means ______.
4. The following are not the use of acoustic information ( )
A. The rumble of thunder in the distance indicates a possible heavy rain.
B. Doctors use B-ultrasound to observe people’s physical condition
C. Surgeons use ultrasound to remove stones from the human body
D. When choosing a porcelain bowl, experienced people always knock it to distinguish the sound quality.
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