"The Utilization of Sound" Sound Phenomenon PPT Courseware 7

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"The Utilization of Sound" Sound Phenomenon PPT Courseware 7

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"The Utilization of Sound" Sound Phenomenon PPT Courseware 7

Want to discuss

What does it mean when we hear thunder? What does it mean to hear a ringtone?

What does this tell us about sound?

1. Sound and information

Sound can convey information.

What are some examples of obtaining information through sound?

1. Obtain information directly from sound.

(1) The rumble of thunder indicates a possible heavy rain;

(2) The doctor diagnoses the condition through a stethoscope;

(3) The car repairman listens to the sound of the car engine to determine the fault;

(4) Railway workers will find loose bolts from the abnormal sound when they hit the rails with a hammer;

(5) Acoustic instruments receive infrasound waves generated by earthquakes, volcanoes, typhoons, tsunamis, etc., and determine the orientation and intensity.

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

2. Sound and energy

Explore the experiment: Can sound waves transfer energy?

Equipment: candles, speakers, etc.

Experimental steps:

Hold the sound horn against the candle flame and observe the changes in the flame.

Sound waves can transfer energy.

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

Surgeons use ultrasound waves to deliver energy to remove stones from the body. Ultrasonic atomization. Ultrasonic cleaning of tartar.

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

Small ultrasonic cleaning machine

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

Feedback exercise two

1. Place two identical tuning forks side by side (without contact), with a ping pong ball leaning against tuning fork B. When tuning fork A is struck, you will find that the ping pong ball ______, which illustrates ______.

2. Which of the following uses sound to transmit energy ( )

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.

Class summary

1. Summary of knowledge

(1) Sound and information - Sound can convey information.

(2) Sound and energy - Sound can transmit energy.

2. Summary of thinking procedures

Ask questions - conjecture - design experiments - conduct experiments - conduct inductive analysis - draw conclusions

In-person testing

1. Which of the following examples does not use sound to transmit information ( )

A emits sound waves to detect the location of fish schools

B emits sound waves to detect the distance of the iceberg from the ship

C Emit sound waves to shatter the stones in the patient's body

D emits sound waves to measure the depth of the seafloor

2. Which of the following examples uses sound to transmit energy ( )

A Emits sound waves to detect whether there are cracks in the large steel plate

B Use a stethoscope to check the working condition of the patient's heart and lungs

C Emit sound waves to check the development of the fetus in the mother's body

D emits sound waves to cut hard diamond

3. Which of the following examples does not use echo ( )

A Detect the location of fish schools

B Detect the position of the iceberg leaving the ship

C shatter the patient’s stone

D Measuring the depth of the seabed

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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.

"The Utilization of Sound" Sound Phenomenon PPT Courseware 12:

"The Utilization of Sound" Sound Phenomenon PPT Courseware 12 Review before class 1. How is sound produced? What is the speed of sound? Sound is produced by the vibration of objects. The speed of sound is used to describe the speed of sound propagation, which is equal to the distance that sound travels per second. 2. People can hear sounds..

"The Utilization of Sound" Sound Phenomenon PPT Courseware 11:

"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 and _____ of sound emitters..

"The Utilization of Sound" Sound Phenomenon PPT Courseware 10:

"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 is infrasound...

File Info

Update Time: 2024-12-11

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