"Characteristics of Sound" Sound Phenomenon PPT Courseware 2

Description

"Characteristics of Sound" Sound Phenomenon PPT Courseware 2

1. Tone

Enjoy the music clips of Dolphin Sound's "Opera 2" and feel the high and low notes.

Experiment 1:

If two beakers with different amounts of water are tapped, will the sound be the same?

What does the pitch have to do with it?

Group experiment 2: Place a ruler on the table with one end sticking out of the table. Move the ruler and listen to the sound it makes when it vibrates. At the same time, pay attention to how fast the ruler vibrates. Change the length of the ruler beyond the edge of the table and move the ruler again with the same force.

What does physics use to describe how fast an object vibrates? Read P32 to find out the corresponding concepts.

1. Frequency: The number of times an object vibrates per second.

Unit: Hertz Symbol: Hz

2. The higher the frequency, the higher the pitch.

2. Loudness

The strength of a sound is called loudness. What does the loudness of a sound relate to?

1. Amplitude: describes the amplitude of the vibration of an object.

2. Factors affecting loudness:

The greater the amplitude, the greater the loudness;

Loudness is related to the distance of a person from the sound source.

think

"Don't dare to speak loudly for fear of frightening the heavens" "Sing loudly" "Whisper in a low voice" "Deafening" does it refer to pitch or loudness?

Practice in class

l. As shown in the figure, in an experiment to explore the pitch of pitch, when the length of the steel ruler extending out of the table increases, the vibration of the steel ruler will become ______ (fill in "slow" or "fast"), so what is heard The pitch will change _____ (fill in "low" or "high"). Keep the length of the steel ruler sticking out of the table unchanged. When the steel ruler is moved with greater force, the vibration amplitude of the steel ruler changes to ______ (fill in "big" or "small"), so the loudness heard changes to ________ (fill in "big" or "small").

2. Based on the information given in the picture, decide which of the following statements is correct ( )

A. Bats can emit sounds with a frequency of 400 Hz

B. Humans can hear all frequencies of sounds emitted by bats

C. The frequency range of human hearing is larger than the frequency range of human vocalizations.

D. 15 Hz sound can be heard by human ears as long as the amplitude is large enough.

3. The wings of insects vibrate when they fly. Butterflies vibrate 5 to 6 times per second, and bees vibrate 300 to 400 times per second. When they all fly behind you, rely on your hearing ( )

A. Can feel butterflies flying behind the body

B. You can feel bees flying behind you

C. You can feel them flying behind you

D. You can’t even feel them flying behind you

4Which of the following statements about sound is incorrect ( )

A. "Deafening" mainly refers to the high pitch of the sound.

B. "Partition walls have ears" means that solid objects can also transmit sound

C. "You will know a person by hearing his voice" mainly based on the timbre.

D. "Speak softly" mainly means that the loudness of the voice is low

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"Characteristics of Sound" Acoustic Phenomenon PPT Courseware 11 Learning Objectives 1. I want to know what pitch and loudness are and be able to distinguish between them. Through exploration, I can understand the relationship between pitch and frequency, and the relationship between loudness and vibration radiation. I will initially use the control variable method to design experiments.

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Update Time: 2024-10-03

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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