"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 5

Description

"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 5

think about it

Please think about the sounds you have heard and write them down.

In natural phenomena and daily life, we hear so many different types of sounds. Do students want to know how sounds are generated and spread?

Think about it, do it

experiment one

Touching his vocal cords, he said: Welcome all leaders and colleagues to come and give us guidance. Feel the sensation in your hands and name it.

Experiment 2

Observe Figure 2.1-1, stir the tensioned rubber band, and observe the changes in the rubber band.

Experiment 3

Press a steel ruler firmly on the table, extend one end from the edge of the table, move the steel ruler, and observe the changes in the steel ruler.

Think and discuss issues

(1) In the above experiments, are the objects making sounds the same? Does it make the same sound?

(2) What characteristics do these objects have in common when they make sounds?

(3) Based on this, how is sound produced?

2. Propagation of sound

How does sound travel?

How do vibrating objects transmit sound to our ears?

Sound is an invisible substance. How does sound propagate in the air?

Sound travels as waves in all media.

Sound can be transmitted through all solid, liquid, gas and other substances as media. These substances as transmission media are often referred to as media.

Sound travels through media. What are the conditions for sound production?

1. All sound-producing objects are in ________. The sound of drums that can be heard by human ears is produced by the vibration of ______________. Immediately after you stop beating, touch the drum head with your hand and find that it is in _______. Press and hold the drum head. Then _______ makes a sound.

2. The vocalizers in the lyrics "The wind is roaring, the horses are braying, and the Yellow River is roaring" are _________, _________, and __________ respectively.

3. In windy weather, the wires erected on the roadside will buzz. This sound is caused by the wires _______.

4. If you tap one end of a long iron pipe filled with water, how many sounds will be heard at the other end farther away?

6. Which of the following musical instruments relies on solid vibration to produce sound ( )

A. Large B. flute c. piano d. suona

7. Don’t make loud noises when fishing, because fish will be scared away when they hear human voices. This means ( )

A. Only air can carry sound

B. Both air and water can carry sound

C. Water cannot carry sound

D． Sound can travel under any conditions

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Update Time: 2024-09-07

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

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