"The Utilization of Sound" Sound Phenomenon PPT Courseware 11

Description

"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 is related to the _______ of the sound emitter. The greater the _______, the greater the loudness.

4. Even if you are blindfolded, you can distinguish the voices of your classmates because each student’s _______ is different.

5. Most people experience sound in the frequency range from _______HZ to _______HZ.

teaching objectives

1. Understand some applications of acoustic knowledge in modern technology

2. Obtain knowledge about the use of sound in social life from pictures through observation

3. Through learning, understand the application of sound in modern technology and further strengthen the cultivation of students' scientific literacy

1. Sound and information

1. Earthquakes, typhoons, and nuclear explosions will produce _______

2. Based on the principle of echolocation, scientists invented sonar. Using sonar systems, people can detect the depth of the ocean, and fishermen use sonar to obtain information about fish schools in the water.

2. Sound and energy

Ultrasonic lithotripter

By emitting ultrasonic waves to the stones in the human body, the stones will be broken into fine powder, so that they can be smoothly excreted from the body.

Ultrasonic humidifier

The ultrasonic humidifier uses the principle of ultrasonic high-frequency oscillation to atomize water into ultrafine particles of 1-5 microns. The water mist is diffused into the air through a pneumatic device, thereby achieving the purpose of uniformly humidifying the air.

Small ultrasonic cleaning machine

Cleaning items: electronic products, mechanical hardware accessories, glasses, jewelry, watches, coins, fruits, etc.

Summary

1. Sound can convey information. like:

(1) Echolocation and sonar.

(2) B-ultrasound.

2. Sound can spread energy. like:

(1) Ultrasonic cleaning of watches, etc.

(2) Ultrasonic vibration removes stones.

Compliance in court

1. When a railway worker hits the rail with a hammer, he will find loose bolts in the abnormal sound, which shows that ________ can be transmitted through sound.

2. Bats can use echo to determine the ________ of a target. This method is called ________. Scientists used this principle to invent the ________ system.

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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: 2024-11-24

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

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