"The Occurrence and Propagation of Sound" PPT

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"The Occurrence and Propagation of Sound" PPT

Part 1: The production of sound

Experiment 1: Place two fingers gently on the throat and make a sound.

What did you notice? __________

Experiment 2: Pulling a Tightened Rubber Band

Did you hear the sound? __________

What kind of movement is the rubber band doing? __________

Experiment 3: Strike the tuning fork, hear _______, and find the tuning fork ________.

Hold the tuning fork with your hand and the tuning fork stops vibrating. Can you still hear the sound? _______

Experiment 4: What phenomena will be seen when a sounding tuning fork touches the water surface? What phenomena will be seen when a sounding tuning fork touches a hanging table tennis ball?

Conclusion: From the above phenomenon, it can be concluded that what kind of movement is the tuning fork doing? __________

The generation and spread of sound PPT, Part 2: The generation of sound

1. Causes of sound:

Sound is produced due to the vibration of objects

All objects that produce sound are vibrating. When the vibration stops, the sound production stops.

2. Sound source: the object that is making sound

Gases, solids, and liquids can all be used as sound sources

The occurrence and spread of sound PPT, the third part: the spread of sound

How does sound travel from the object that makes it to a distant place?

For sound to spread, what might be needed as a medium?

How do the sounds we usually hear reach our ears and cause hearing?

Experiments show that air can transmit sound.

The vibration of the tuning fork causes the air around it to behave like water, causing ripples that spread around. Sound travels in the form of waves, which we call sound waves.

The occurrence and propagation of sound PPT, Part 4: The speed of sound propagation

If you shout at a high wall or cliff, it will take a while before you hear an echo. What does this mean?

This shows that the propagation of sound takes a certain amount of time, and the speed of sound propagation is described by the speed of sound.

The distance that sound travels per second is called the speed of sound.

Occurrence and propagation of sound PPT, Part 5 content: Practice:

1. As the saying goes: The sound of wind, rain, and reading are all in your ears.

Among them, the sound of wind, rain, and reading are the sounds produced by _____, ______, and __________ vibrations respectively, and these sounds are transmitted through _____.

2. In an experiment to demonstrate that sound is generated by the vibration of an object, the sounding tuning fork is placed close to a light ball under the suspension wire, and the ball is bounced away many times. In this experiment, the role of the ball is _______________.

3. Generally speaking, the walls around the Great Hall are made uneven like a honeycomb. This is for ( )

A weaken the sound wave reflection B enhance the sound wave reflection

C To enhance the loudness of the sound D Just for decoration

Occurrence and propagation of sound PPT, Part 6: Summary

1. Sound is produced by the vibration of objects.

2. The propagation of sound depends on the medium (gas, liquid, solid).

3. The speed of sound is related to both the type of medium and the temperature of the medium.

The speed of sound in air at 15oC is 340m/s.

Keywords: Zhejiang Education Edition seventh grade science PPT courseware for the second volume free download, PPT download on the occurrence and spread of sound, .PPT format;

For more information about the "Occurrence and Propagation of Sound" PPT courseware, please click on the "Occurrence and Propagation of Sound" ppt tag.

"The Occurrence and Propagation of Sound" PPT download:

"Occurrence and Propagation of Sound" PPT Download Part One: Learning Objectives 1. Know that sound is produced by the vibration of objects. 2. Know that the propagation of sound requires materials. 3. Know the propagation speed of sound in the air... The occurrence and propagation of sound P..

"Occurrence and Propagation of Sound" PPT courseware:

The first part of the PPT courseware "Occurrence and Propagation of Sound": Experiment 1, a rubber band, a steel ruler, and a pen cover, try to make them make sounds. 1. When the rubber band and steel ruler stop vibrating, can you still Hear a sound? 2. Use two fingers to gently...

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Update Time: 2024-10-02

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