"The Utilization of Sound" Sound Phenomenon PPT Courseware 9

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.

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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.

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Update Time: 2024-09-09

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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