"The Propagation of Sound" Sound PPT Courseware 4

Description

"The Propagation of Sound" Sound PPT Courseware 4

Purpose:

1. Strengthen students' practical ability and cultivate students' ability to observe and summarize.

2. Observe, analyze and summarize the different propagation effects of sound in different materials.

experiment equipment:

Alcohol lamp, asbestos net, flask, rubber stopper, glass tube, latex tube, leather pipe clamp, tripod, small bell, sink, music player, toothpick, paper cup, thin string, plastic bag, sand, water, chopsticks, glass bottle , soybeans

Experimental steps---1:

1. Put your ear close to the table and tap the table leg lightly.

2. Put the mobile phone with music playing into the water.

3. Play music from a distance.

Phenomenon: We all hear sounds.

in conclusion:

1. Sound can travel through solids

2. Sound can travel through liquids

3. Sound can travel through the air

Experimental steps---2:

1. Put a small bell in the flask and shake it gently to listen to the sound.

2. Add a small amount of water to the flask, bring it to a boil and clamp the leather tube. Shake gently and listen to the sound.

Phenomenon:

When it is not heated, you can hear the sound of the small bell shaking; after heating, you can still hear the sound. (You should not hear the bell ringing).

Failure reason analysis: The heating method cannot form a vacuum environment.

The conclusion should be drawn: Sound cannot propagate in a vacuum.

Application test----"Home Phone" production:

1. Poke a small hole in the bottom of each of the two paper cups.

2. Find a long thread and pass it through the small holes in the bottom of the two cups, and tie a small piece of wooden stick to the ends of the thread.

3. Tighten the string, one person whispers to the paper cup, and the other person puts the paper cup over his ear to listen.

Experimental results:

1. Sound can propagate in solids, liquids, and gases.

2. Sound cannot propagate in a vacuum.

3. The propagation effect of sound is best in solids, second in liquids, and worst in gases.

Analyze the following sound propagation phenomena:

1. In "Railway Guerrilla", the guerrillas lie on the railway tracks and listen to see if the enemy train is coming.

2. With their heads in the water, synchronized swimmers can still keep up with the beat of the music and perform neat movements.

3. Astronauts cannot talk face to face in the universe.

4. Once the horn sounds, it can be heard everywhere on campus.

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

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File Info

Update Time: 2024-11-22

This template belongs to science courseware Fourth Grade Science Volume 1, Textbook Edition industry PPT template

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