"Characteristics of Sound" Sound Phenomenon PPT Courseware 10

Description

"Characteristics of Sound" Sound Phenomenon PPT Courseware 10

teaching objectives

1. Understand the characteristics of sound

2. Know that pitch is related to the frequency of the sound emitter, and loudness is related to the amplitude of the sound emitter.

3. Pay attention to the rigor of scientific terms

4. Different sound emitters emit musical sounds with different timbres.

1. Tone

1. The pitch of the voice is called pitch

2. The number of vibrations per second is called frequency.

3. What factors are related to pitch?

The higher the frequency, the higher the pitch

The lower the frequency, the lower the pitch

4. The unit of frequency is Hertz, referred to as Hertz, and its symbol is Hz.

Exercise 1: If an object vibrates 100 times in one second, the frequency is 100Hz.

Exercise 2: The mosquito's wings vibrate 6400 times in 10 seconds, and the frequency of mosquito wings vibration is 640Hz.

5. The frequency emitted by humans is approximately 85-1100 Hz

2. Loudness

7. Loudness: the strength (size) of the sound

8. In physics, amplitude is used to represent the amplitude of the vibration of an object, which refers to the maximum distance that the sounding body deviates from its original position when it vibrates.

9. What factors are related to loudness?

(1) The greater the amplitude of the object's vibration, the greater the loudness.

The smaller the amplitude of the object's vibration, the smaller the loudness.

(2) Distance from the sound source

3. Tone

Listen to the music and determine what instrument is playing it

What factors are related to timbre?

10. Different sound-emitting bodies have different materials and structures, and the timbre of the sound is different.

Do it

1. We can generally distinguish men and women correctly based on people’s speaking voices. This is mainly based on the sound of people’s speaking voices ( )

A pitch B loudness C timbre D speed of sound

2. When the bass sings solo, the soprano sings softly. The correct description of their voices is ( )

A Bass is lower pitched and louder than soprano.

B Bass has a lower pitch and less loudness than a soprano.

C Bass is higher pitched and less loud than soprano.

D Bass is higher pitched and louder than soprano.

3. When buying porcelain products, you often pick up two porcelain products and touch them, listen to the sound they make, and then decide which one to buy. The basis for your judgment is based on the sound ( )

A volume B tone C loudness D tone

4. The whistle of the ship on the dock spreads far because ( )

A The frequency of the whistle is high B The whistle is loud

C The sound of the whistle is good. D The sound of the whistle spreads quickly.

5. "Knowing the person by hearing his voice" makes use of sound ()

A pitch B loudness C timbre D echo

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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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