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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.
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"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...