"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 12

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"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 12

Exploration 1: How is sound produced?

Experience sound production

Can you make them sound?

1. Rubber band

2. Ruler

3. Books

What common characteristics do these objects have in common when observing the sounds they make?

Common feature:

1. Paper is vibrating when it makes sound;

2. The ruler is vibrating when it makes sound;

3. The rubber band vibrates when it makes sound.

Shared feelings:

Touch your throat with your hands and speak loudly to experience the feeling of your hands

Your vocal cords vibrate when you speak.

Guess: The sound is caused by the object _______.

Explore: Does the tuning fork vibrate when it sounds?

Conversion method: Convert a phenomenon that is not easily observed into a more obvious phenomenon of another object and express it indirectly.

in conclusion

1. Sound is produced by the vibration of objects.

2. The object that is making sound is called the sound source.

Exploration 2: How does sound spread?

Propagation of sound:

Sound cannot travel through a vacuum;

Air can carry sound;

in conclusion

1. Sound can propagate through all solids, liquids, and gases. The substance through which sound propagates is called a medium.

2. The propagation of sound requires a medium.

3. Sound cannot be transmitted in a vacuum.

Student Activities:

Tap the tabletop twice with the same amount of force, once to listen directly, and once to cover one ear and put the other ear against the tabletop to listen to feel the effects of solid sound transmission and air sound transmission.

Information obtained from the above table:

1. Generally, the speed of sound propagation is fastest in solids, followed by liquids, and the slowest speed in gases.

2. The propagation speed of sound is related to the temperature of the medium;

3. The propagation speed of sound is related to the type of medium;

4. The propagation speed of sound in (15℃) air is 340m/s

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Update Time: 2024-10-03

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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