"The Utilization of Sound" Sound Phenomenon PPT Courseware 4

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"The Utilization of Sound" Sound Phenomenon PPT Courseware 4

do you remember?

1. Sound travels in the air in the form of _____.

2. The frequency range of human hearing is ______________

Sound waves with frequency _____________ are called ultrasonic waves

Sound waves with frequency __________ are called infrasound waves

1. Sound and information

Elephants communicate with sounds that are inaudible to humans. These sounds are __sound waves.

Many activities in nature, such as earthquakes, volcanic eruptions, typhoons, etc., are accompanied by the generation of sound waves. One of its characteristics is the propagation distance___.

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

Applications: bat foraging, car reversing radar, sonar detection of ocean depth, "B-ultrasound".

2. Sound and energy

Can sound waves transfer energy?

Experimental phenomenon: When the speaker plays music, the candle flame will shake.

Experimental conclusion: Sound waves can transfer energy

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

1. Use ultrasonic waves to transmit energy and clean precision machinery such as watches;

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

3. Ultrasonic atomization and ultrasonic cleaning of tartar;….

Classroom training

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

2. Bats can use echo to determine ________. This method is called ________. Scientists used this principle to invent ________.

3. None of the following are those that use sound to obtain 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.

4. Generally speaking, the walls around the city hall are made uneven, like a honeycomb. This is for ()

A. Reduce the reflection of sound waves B. Enhance the reflection of sound waves

C. Enhance the loudness of the sound D. Just for decoration

There are two main aspects of using sound:

1. Sound and information: What examples in textbooks and daily life illustrate that people can use sound to convey information?

2. Sound and energy: Can sound waves transmit energy? What phenomena can be proven? What are some examples of utilizing the energy of sound in modern life?

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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...

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Update Time: 2024-11-17

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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