"The Utilization of Sound" Sound Phenomenon PPT Courseware 10

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"The 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 are infrasound waves?

Ultrasound: sound above 20000Hz

Infrasound: Sound below 20Hz

1. Sound and information: Sound waves can transmit information

What other examples are there of obtaining information through sound?

1. Get information from sounds

When you hear thunder, you know it might rain;

The car mechanic listens to the sound of the car engine to determine the fault;

2. Obtain information from infrasound waves

3. Obtain information from ultrasound

(1) Smart bat

adapting methods:

Echolocation: Determine the location and distance of the target based on the direction and time of the arrival of the echo.

(2) Color B-type ultrasonic diagnostic instrument (color ultrasound)

2. Sound and energy: Sound waves can transmit energy

What are some examples of using sound waves to transfer energy?

1. Surgeons use ultrasonic waves to transmit energy to remove stones from the human body.

2. Workers use ultrasonic waves to transmit energy and clean precision machinery such as clocks and watches.

Purpose of use: cleaning, degassing, disinfection, emulsification, mixing, replacement, and extraction of objects.

Usage departments: industrial and mining enterprises, laboratories of scientific research units in colleges and universities; hospitals; electronic workshop assembly lines; watch and eyewear stores, jewelry stores; families.

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

3. Ultrasonic humidifier

The principle of ultrasonic high-frequency oscillation is used 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.

Apply what you learn

1. When railway workers hit the rails with a hammer, they will find loose bolts from the abnormal sound, which shows that ______ can be obtained through sound.

2. Bats use echo to determine:

This method is called ______. Scientists used this principle to invent ______.

3. As the saying goes, "swallows flying low and snakes flying across the aisle" convey the message that ______ is coming; when thunder hits, the house will vibrate because sound waves can transmit ______.

4. Which of the following does not use sound to convey information ( )

A. The rumble of thunder in the distance indicates a possible heavy rain.

B. Doctors use B-ultrasound to observe people’s physical condition

C. Surgeons use ultrasound to remove stones from the human body

D. When choosing a porcelain bowl, experienced people always knock it to distinguish the sound quality.

Consolidate and improve

1. Diagnosis in traditional Chinese medicine generally involves "looking", "smelling", "asking" and "cutting". Among them, the diagnosis method that uses the sound of diseased organs to provide information is called ( )

A. Look B. Smell C. Ask D. Cut

2. Scientists monitor and forecast typhoons and earthquakes by receiving ( ) sounds.

A. Sound waves that can be heard by human ears B. Ultrasonic waves C. Infrasound waves

3. Which of the following statements is correct ( )

A. Both dolphins and elephants use ultrasound to communicate with each other

B. Dolphins and elephants both use infrasound waves to communicate with each other

C. Ultrasonic waves used by dolphins and infrasound waves used by elephants

D. Infrasound used by dolphins and ultrasonic waves used by elephants

4. What is used to clean precision machinery such as watches and clocks ( )

A. Ultrasound B. Infrasound

C. Sound waves that can be heard by the human ear

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Update Time: 2024-11-30

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

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