"Changes in Sound" Sound PPT

Description

"Changes in Sound" Sound PPT

Part 1: Observe and compare changes in sound intensity

Let part of a steel ruler or plastic ruler extend about 10 to 12cm from the table. Use one hand to hold one end of the ruler, and the other hand to move the other end of the ruler.

First, gently move the steel ruler, observe the amplitude of the up and down vibration of the ruler, and how strong the sound is, and record the amplitude of the vibration as large or small and the sound as strong or weak.

Push the steel ruler again and compare it with the previous experiment. What are the similarities and differences in the amplitude of the ruler's up and down vibration and the sound it makes? and record it.

Repeat the above experiment 3 to 4 times to understand the relationship between the amplitude of the vibration and the intensity of the sound when an object vibrates, and describe it accurately.

What is the relationship between the amplitude of an object's vibration and the intensity of the sound?

The strength of sound can be described by volume.

The volume is determined by the amplitude of the object's vibration:

The greater the vibration amplitude, the stronger the sound;

The smaller the vibration amplitude, the weaker the sound.

Sound Changes PPT, Part 2: Observe and Compare the Changes in Sound Pitch

Number the four cups No. 1, 2, 3, and 4; fill cup No. 1 with water, fill cup No. 2 with half a cup (about 3/4 cup) of water, and fill cup No. 3 with half a cup (about 1 cup). /2 cup) water, fill the No. 4 cup less than half a cup (about 1/4 cup) of water.

If you hit the cup rims with small wooden sticks one after another, predict how the sound they make will change? Sort by sound high, higher, lower, low.

Repeatedly tap the rims of the cups in the order from cup No. 1 to cup No. 4, or from cup No. 4 to cup No. 1, and compare the changes in the sounds they make. Then compare with the group’s predictions.

Flick the rubber band to make a sound.

Pull the rubber band tighter and flick it again. What happens to the sound the rubber band makes?

Loosen the rubber band slightly and play again. What happens to the sound the rubber band makes?

How to describe the change in the sound produced by a rubber band?

The tighter the rubber band, the faster it vibrates and the higher the sound;

The looser the rubber band, the slower the vibration and the lower the sound.

What is the relationship between the speed of an object's vibration and the pitch of the sound?

The level of sound can be described by pitch. Pitch is a quantity that describes how fast an object vibrates.

The faster an object vibrates, the higher the sound it makes;

The slower an object vibrates, the lower the sound it makes.

Keywords: free download of Chinese PPT courseware for the first volume of the fourth grade of the textbook version, download of the change of sound PPT, download of the sound PPT, .PPT format;

For more information about the "Changes in Sounds" PPT courseware, please click on the "Changes in Sounds ppt" ppt tag.

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Update Time: 2024-10-18

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

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