People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
Shanghai Science Edition Ninth Grade Physics
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition 8th Grade Physics
Beijing Normal University eighth grade physics volume one
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
Lu Jiao Edition Ninth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
Lu Ke Edition High School Physics Compulsory Course One
People's Education Press High School Physics Compulsory Course II
Guangdong and Shanghai version of eighth grade physics volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao Edition Eighth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
!["The Utilization of Sound" Sound Phenomenon PPT Courseware 9](http://daogebangong.oss-cn-beijing.aliyuncs.com/ppt/preview/1/3c6ae696-b029-46d8-a63d-1822b77deb77.webp)
Category | Format | Size |
---|---|---|
Lu Jiao edition eighth grade physics volume 1 | pptx | 6 MB |
Description
"The Utilization of Sound" Sound Phenomenon PPT Courseware 9
learning target
1. Understand that sound can convey information;
2. Understand that sound can transmit energy;
3. Understand the application of sound-related knowledge in modern technology
1. Sound and information
People have human speech, and animals have animal speech! Not only can animals communicate through sounds, but some can also use "sounds" that humans can't hear to obtain information. Do you know anything about this? Please tell me, how do they obtain information?
echolocation
Bats emit ultrasonic waves when flying. When these sound waves hit walls or insects, they are reflected back. Based on the direction and time of arrival of the echo, bats can determine the location and distance of the target.
The method used by bats is called echolocation.
Application: Ultrasonic blind guide, reversing radar, sonar.
2. Sound and energy
Sound waves can transfer energy
Application: small ultrasonic cleaning machine
Cleaning items: electronic products, mechanical hardware accessories, glasses, jewelry, watches, coins, fruits, etc.
Ultrasonic humidifier.
The ultrasonic humidifier uses the principle of ultrasonic high-frequency oscillation to atomize water into ultrafine particles of 1-5 microns, and diffuse the water mist into the air through a pneumatic device.
Class summary
1. Sound can convey information. like:
(1) Echolocation: ultrasonic blind guide, reversing radar, sonar.
Sonar: detects ocean depth, detects information about fish schools in the water, etc.
(2) Use sound waves to obtain information about internal diseases in the human body: stethoscope, B-ultrasound.
(3) Disasters can be predicted using infrasound waves.
(4) Use ultrasonic flaw detection, etc.
2. Sound can spread energy. like:
(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.
Standard expansion
See "Study Guide"
The main characteristics of ultrasonic and infrasound waves:
Ultrasound: fast vibration, large energy, strong penetrating power and strong directionality.
Infrasound waves: spread over long distances, and powerful infrasound waves are very destructive.
Keywords: sound phenomenon teaching courseware, sound utilization teaching courseware, Lujiao version eighth grade physics PPT courseware download, eighth grade physics slide courseware download, sound phenomenon PPT courseware download, use of sound PPT courseware download, .PPT format;
For more information about the PPT courseware "The Utilization of Sound Phenomenon and Sound", please click on the Utilization of Sound Phenomenon ppt ppt tab.
"The Utilization of Sound" Sound Phenomenon PPT Courseware 12:
"The Utilization of Sound" Sound Phenomenon PPT Courseware 12 Review before class 1. How is sound produced? What is the speed of sound? Sound is produced by the vibration of objects. The speed of sound is used to describe the speed of sound propagation, which is equal to the distance that sound travels per second. 2. People can hear sounds..
"The Utilization of Sound" Sound Phenomenon PPT Courseware 11:
"The Utilization of Sound" Sound Phenomenon PPT Courseware 11 Review the past and learn the new 1. The three elements of sound are: _______, _______, and _______. 2. The pitch of the sound is determined by the _______ of the sound-emitting body's vibration. The higher the _______, the higher the pitch. 3. Loudness and _____ of sound emitters..
"The Utilization of Sound" Sound Phenomenon PPT Courseware 10:
"Utilization of Sound" Sound Phenomenon PPT Courseware 10 Review before class 1. How is sound produced? What is an echo? Sound is produced by the vibration of objects. When sound travels forward and encounters obstacles, it is reflected back and is called an echo. 2. What is ultrasound? What is infrasound...
File Info
Update Time: 2024-09-09
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