"Characteristics of Sound" Sound Phenomenon PPT Courseware 9

Description

"Characteristics of Sound" Sound Phenomenon PPT Courseware 9

learning target

1. Understand the characteristics of sound;

2. Know that the pitch of a sound is related to the frequency of the sound emitter;

3. Know that the loudness of sound is related to the amplitude of the sound emitter;

4. Know that different sound emitters produce different timbres.

Knowledge point one: tone

1.Tone:

Refers to the pitch (or thickness) of the sound

For example: soprano, bass, high-pitched voice, deep voice

2. What is the relationship between the pitch and pitch? make a guess

Exploration 1: What factors are related to pitch?

Equipment: saw blade

Press a saw blade firmly on the table, with one end extending out of the edge of the table, move the saw blade, change the length of the steel ruler extending out of the edge of the table, and move it again with the same force.

Compare the speed of the saw blade vibration and the pitch of the sound.

Read pages 32-33 of the textbook and answer the questions:

1. What is frequency?

2. In the SI unit, what is the unit of frequency?

3. What is the relationship between the speed, frequency and pitch of an object's vibration?

4. What is the frequency range that most people can hear?

5. What is ultrasound? What are infrasound waves?

Group work:

1. Sometimes when people think it is quiet and there is no sound, why do cats or dogs suddenly become very alert?

2. What sound waves do bats emit to capture insects?

3. What sound waves do elephants rely on to communicate with each other?

4. Why can’t we hear the vibration of butterfly wings, but we can hear the annoying sound of mosquitoes? (Tip: The vibration frequency of butterfly wings is 5-6HZ, and that of mosquitoes is 500-600HZ)

Knowledge Point 2: Loudness

1. Loudness:

The intensity (or volume) of the sound.

For example: singing loudly, whispering in a low voice, echoing softly, having a loud voice, and beating the drums loudly.

2. What does loudness relate to? make a guess

Amplitude: The amplitude of the vibration of the sounder.

Exploration 2: What factors are related to loudness?

Use the equipment at hand: tuning fork, hammer, iron stand, table tennis ball, string

Method: Strike the tuning fork with different forces, listen to the volume of the sound, and observe the extent of the bounce of the table tennis ball.

Loudness is related to the amplitude of the sounder’s vibration.

Loudness is also related to the distance to the sound source. The greater the distance, the smaller the loudness.

It can reduce the dispersion of sound and make the sound travel farther.

Challenge yourself:

1. The "thin" and "low" of the voice refer to _______.

2. The words "lower your voice and speak" and "loud loudly" that are commonly used in life actually refer to the _______ of the voice.

3. Compared with the cry of cattle, the sound of mosquitoes is higher in pitch and louder in _______.

4. A bass singer is singing loudly, and he is accompanied softly by a soprano. Which of the following statements is correct ( )

A. Male singers have louder voices and female singers have higher pitches.

B． Male singers are louder, female singers are lower pitched

C. Male singers have higher pitches and female singers have louder voices.

D． They are equally loud

5. The following four sentences: ① This song is too high-pitched and I can’t sing it; ② Sing loudly; ③ She sings high notes;

④Please do not make loud noises. Among them, the word "high" refers to the pitch ( )

A. ①② B． ②④

C. ①③ D. ③④

Challenge yourself:

1. Please explain which feature of sound each refers to by "sound" in the following sentences?

(1) Sorry, please speak louder ( )

(2) Li Ning’s singing voice is so beautiful ( )

(3) The sound made by the electric saw is very sharp and harsh ( )

2. The rabbit in the fable heard the voice and the knock on the door and opened the door based on what he did not do ( )

A. Loudness of speaking voice B. pitch of voice

C. The timbre of the voice D. The difference in knocking sounds

3. The guitar is a favorite instrument among young people. Before playing, you need to adjust the tightness of the strings. The purpose of this is to adjust the sound of the strings ( )

A. Amplitude b. Loudness c. Tone D. timbre

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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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