"Ultrasound and Infrasound" The World of Sound PPT Courseware 2

"Ultrasound and Infrasound" The World of Sound PPT Courseware 2
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"Ultrasound and Infrasound" The World of Sound PPT Courseware 2

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"Ultrasound and Infrasound" The World of Sound PPT Courseware 2

Review: The physical meaning, definition, unit, and calculation formula of frequency

Research has found that the frequency range of sound waves is 10-4 ~ 1012Hz

The frequency range of sound heard by normal human ears is 20 ~ 20000Hz

one. Ultrasound

1. Sound above 20000Hz

2.Application

①Ultrasound navigation capabilities

② Ultrasound has strong penetrating ability

Ultrasound diagnostic instrument (B-ultrasound)

Check and treat diseases

Ultrasonic metal flaw detector

Detect internal defects in metal

③ Ultrasonic has strong “breaking” ability

④Ultrasound and agriculture

Improve germination rate and shorten germination time

2. Infrasound

1. Sound below 20Hz

2. High-energy infrasound is harmful to machinery, buildings, and human bodies.

Keywords: The World of Sound teaching courseware, Ultrasound and Infrasound teaching courseware, Shanghai Science Edition eighth grade physics PPT courseware download, Eighth grade physics slide courseware download, The World of Sound PPT courseware download, Ultrasound and Infrasound PPT courseware download ,.PPT format;

For more information about the "The World of Sound Ultrasound and Infrasound" PPT courseware, please click the "The World of Sound ppt Ultrasound and Infrasound ppt" tag.

"Ultrasound and Infrasound" The World of Sound PPT Courseware 3:

"Ultrasound and Infrasound" The World of Sound PPT Courseware 3 [Experience] Try it and listen Activity 1: Use the same force to move different plastic rulers, as shown in Figure A. Move the 20cm long student ruler, as shown in Figure B Turn the 1m long plastic ruler. Activity 2: As shown in the figure, take a cylindrical shape..

"Ultrasound and Infrasound" The World of Sound PPT courseware:

"Ultrasound and Infrasound" The World of Sound PPT courseware Self-study text, answer questions 1. What is the frequency range of sound waves? 10-4~1012Hz 2. What is the frequency range of sound heard by normal human ears? 20 ~ 20000Hz 3. What is the highest frequency of sound that dogs can hear...

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Update Time: 2024-11-13

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"Ultrasound and Infrasound" The World of Sound PPT Courseware 2
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