"The Generation and Propagation of Sound" PPT teaching courseware on acoustic phenomena

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"The Generation and Propagation of Sound" PPT teaching courseware on acoustic phenomena

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The production of sound

1. As shown in the picture, when the speaker is not making sound, the foam plastic on the paper cone is stationary, but when the speaker is sounding, the foam plastic on the paper cone keeps beating. This phenomenon shows that the objects making sound are vibrating.

2. Regarding the production of sound, which of the following statements is correct (B)

A. Only the vibration of a solid can produce sound

B. Sound is produced by the vibration of objects

C. Objects can make sounds without vibrating

D. After the vibration stops, the sound-emitting body can still produce sound.

3. When you play the flute, the flute makes a pleasant sound, and the material that makes the sound is (B)

A. Fingers B. Air column in flute tube

C. Flute D. Lips

Knowledge point 2: Propagation of sound

4. As shown in the picture, place the sounding alarm clock in the glass cover and you can (optional "can" or "cannot") hear the sound of the alarm clock. Then turn on the air extractor to extract air. As the air in the glass cover is extracted, the sound of the alarm clock gradually becomes smaller (optional "get louder" or "get smaller"). From this, you can guess what will happen after the air is completely extracted. It can be deduced that sound cannot propagate in a vacuum.

5. Find a hard wall that separates two rooms, place a radio in one room, lower the volume so that the sound becomes soft, close the door, and enter another connected room. As shown in the picture, place the glass against the wall so that the rim of the glass is against the wall. Hold the glass with one hand and put your ear to the bottom of the glass. You can (choose "can" or "cannot") hear the sound. This shows that both solids and gases can transmit sound.

6. During the exam, we hear the “start answering” bell, and the main communication medium is (A)

A.Air B.Wall

C.Floor D.Wire

Knowledge point 3 Speed ​​of sound

7. The speed of sound in air at 15 ℃ is 340 m/s; in summer, we hear thunder about 2 seconds after seeing lightning. Please estimate that we are about 680 m away from the thunder.

8. The echo reaches the human ear more than 0.1 s later than the original sound, so that the human ear can distinguish the echo from the original sound. To hear the echo, the closest distance between the obstacle and the sound emitter should be 17 meters.

9. The propagation speed of sound waves in glass is approximately (D)

A.5 m/s B.50 m/s

C.500 m/s D.5000 m/s

PPT on the production and spread of sound, part 2: improvement of comprehensive capabilities

10. At concerts, pleasant music is played by various musical instruments. Generally speaking, wind instruments use the vibration of gas to make sound; string instruments use the vibration of solids to make sound; percussion instruments use solids (optional) The vibration of "gas", "liquid" or "solid") makes sound.

11. There is no air on the moon. Even if two astronauts on the moon are very close to each other, they must use radio waves to communicate. This shows that the propagation of sound requires a medium; put your ear against one end of the long iron pipe and let the other person knock it. At the other end of the iron pipe, you will hear two knocking sounds. The first knocking sound you hear is transmitted through the iron pipe.

12. Shown in the figure is a device commonly used when exploring sound phenomena. When the tuning fork is struck, the ball will bounce up. This phenomenon shows that

Sound is produced by the vibration of objects; if this experiment is done on the moon, the ping-pong ball will (choose "yes" or "no") bounce.

13. During a 100-meter race, if the finish timer starts timing after hearing the gunshot, the recorded time will be shorter than the actual time used by the athlete (A)

A.Shorter B.Longer

C. Same D. Unable to determine

14. When we hear an airplane roaring directly overhead, which of the following statements is correct (C)

A. The plane has not yet reached directly overhead

B. The plane is directly overhead

C. The plane has flown directly overhead

D. The above three situations are all possible

15. "If the propagation speed of sound in the air changes to 2 m/s, how will the world around us change?" Regarding the discussion of this issue, a student proposed the following four related scenarios. Please judge The incorrect one is (A)

A. Students in the classroom can hear the teacher’s lectures more clearly

B. The car’s horn can no longer play its original role

C. When we hear the sound of an airplane coming from an altitude of 10,000 meters, we cannot see the airplane

D. The performance of the brass band in the venue will become worse.

The production and spread of sound PPT, the third part: Expanding exploration and breakthroughs

18. Sound propagates at different speeds in different media. Use the information in the table below to answer the questions:

(1) What are the rules for the propagation speed of sound in different media (just write two)?

(2) One end of a metal pipe with a length of 884 m is struck, and two sounds are heard at the other end. The two sounds are 2.43 s apart. What is the propagation speed of the sound in the metal pipe? The metal pipe may be made of What material is it made of (the temperature at this time is about 15 ℃)?

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For more information about the "Acoustic Phenomena: The Generation and Spread of Sound" PPT courseware, please click on the "Acoustic Phenomenon ppt: The Generation and Spread of Sound ppt" tag.

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Update Time: 2024-09-27

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

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