"The Utilization of Sound" Sound Phenomenon PPT Courseware 3

Description

"The Utilization of Sound" Sound Phenomenon PPT Courseware 3

Review questions:

1. What does sound include? What does sound refer to?

Sound includes: sound, ultrasonic waves, and infrasound waves.

Sound only refers to that part of sound that can be felt by the human ear.

2. How does sound spread? What does the size of sound depend on?

It is transmitted through the medium.

The size of the sound is related to the amplitude of the object and the distance between the listener and the sound source.

3. What are the characteristics of sound? What factors are they related to?

Pitch (frequency), loudness (amplitude), timbre (material structure)

Thought and Discussion 1: What are some examples of using sound information in life?

1. When filling water into the thermos bottle, you can judge whether the water is full based on the sound the water makes;

2. There is a kettle that buzzes when the water boils. We know that the water is boiling and we need to turn off the heat in time to avoid water spillage.

3. Experienced drivers can judge car faults by listening to the sound of the engine working.

4. Throw a stone into the water in the pond and listen to the sound it makes to determine the depth of the pond.

5. We know who is back at home through the sound of footsteps.

6. People use sonar to measure reefs, port navigation, etc.

Thought and Discussion 2: Can ultrasonic and infrasound waves transmit information?

1. Use ultrasonic waves in engineering to detect hidden cracks, blisters, etc. in workpieces

2. Doctors can accurately obtain image information of internal organs of the human body with the help of ultrasound (B-ultrasound)

3. Scientists use infrasound waves to predict earthquakes, volcanic eruptions, tornadoes, typhoons, and study the structure of the atmosphere, etc.

4. The military uses infrasound waves to detect nuclear explosions in the atmosphere, tracking missiles, etc.

(2) Sound and energy

1. What did the students observe in the first experiment?

2. What does this phenomenon indicate?

3. The property of energy transmission by sound waves can be applied in many aspects. What examples are introduced in the textbook?

(1) Sound waves can be used to clean fine machinery such as clocks and watches.

(2) Surgeons use ultrasonic vibration to remove stones from the human body.

Expand and improve

(1) Ultrasonic waves have two characteristics: one is high energy; the other is that it propagates in a straight line.

(2) Infrasound waves are also called subsounds. They have a wide range of sources, can travel far, and have strong penetrating power.

(3) A new discipline has developed in recent decades: imitation acoustics

Summary of this lesson

1. Sound can convey information. like:

(1) Echolocation:

Sonar: It can detect the depth of the ocean and obtain information about fish schools in the water.

(2) Use ultrasound to obtain information about internal diseases in the human body: B-ultrasound.

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.

In-class testing and high school entrance examination links

1. Which of the following examples does not illustrate that sound waves can transmit information: ( )

A. Experienced workers can judge whether the machine is operating normally by listening to the sound of the machine running;

B. Doctors can use a stethoscope to understand the working condition of the patient's heart;

C. Dentists use ultrasonic waves to clean teeth;

D. Ancient sailors used the echo of their horns to judge the distance to the cliff in the fog.

2. The rumbling thunder in the distance indicates an upcoming heavy rain; when a classmate hears the "ding-dang-dang" sound of the campus clock, he knows that class is about to begin. These illustrate ____________________.

3. Experiments show that only when the echo reaches the human ear 0.1s later than the original sound, can humans distinguish the echo from the original sound. At this time, the distance between the person and the obstacle is at least _____ m. (The speed of sound is taken as 340 m/s)

4. Cover one end of a paper tube with open ends with rubber film and tie it tightly with a rubber band. If you knock the rubber film against the flame, the flame will _____. this means______________.

5. Bats never bump into walls or branches when they come out at night. Which of the following statements is correct ( )

A. Bats’ eyes have night vision function

B. There is moonlight at night

C. Bats have a good sense of smell and can smell out whether there are objects in front of them.

D. Bats emit ultrasonic waves that can return to objects, and the location and distance of the object can be determined based on the echo.

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Update Time: 2024-10-05

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

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