"Characteristics of Sound" Sound Phenomenon PPT Courseware 4

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"Characteristics of Sound" Sound Phenomenon PPT Courseware 4

1. Tone

(1) Definition: The pitch of a sound is called pitch

What factors determine pitch? Press a steel ruler tightly on the table, with one end extending out of the edge of the table. Toggle the steel ruler and listen to the sound it vibrates. At the same time, pay attention to the speed of the steel ruler's vibration. Change the length of the steel ruler extending out of the edge of the table and flip it again. .Pay attention to making the amplitude of the two vibrations of the steel ruler roughly the same. Compare the speed of the vibration of the steel ruler and the tone of the sound in the two situations.

(2) Influencing factors: The pitch of the pitch is determined by the frequency of vibration of the sounding body

The pitch is related to the vibration frequency of the sound-producing object. The frequency indicates how fast the object is vibrating.

1. Frequency

⑴Definition: The number of vibrations per second.

⑵Unit: Hertz (Hz)

The faster an object vibrates, the higher the frequency, and the higher the pitch,

The slower the vibration, the lower the frequency, and the lower the pitch

2. Infrasound and ultrasonic waves

Human hearing range: 20Hz--- 20000Hz

Below 20Hz are called infrasound waves;

Waves above 20,000Hz are called ultrasonic waves.

The language of elephants, earthquakes, volcanic eruptions, typhoons and tsunamis all produce infrasound waves

2. Loudness

(1) Definition: The intensity of sound is called loudness.

What factors does loudness depend on?

Touch the ping pong ball tied to the string lightly to the sounding tuning fork and observe the extent of the bounce of the ping pong ball. Make the tuning fork emit sounds of different loudness and repeat the above experiment.

(2) Influencing factors: The loudness of the sound is related to the amplitude

Is amplitude the only factor that determines loudness?

In practice, loudness is also related to the distance from the sound emitter. The farther away from the sound source, the smaller the sound and the lower the loudness. (Reason: Because sound becomes more dispersed as it travels farther away.)

3. Tone

1. Definition: The sounds emitted by different objects have different characteristics called timbre.

2. Influencing factors: Determined by the material and structure of the sound emitting body

(The timbre is determined by the sound emitter itself. Different sound emitters have different vibration conditions, and the timbre of the sound is different.)

3.Examples

You know the person by hearing his voice; you can tell the difference between the erhu and the piano

practice

1. A soprano is singing softly to accompany a bass who is singing loudly. Which of them has a higher pitch?

The "high" and "low" in "soprano" and "bass" refer to the pitch, so the soprano has a higher pitch and the bass has a lower pitch.

2. At the festival party, the ventriloquist imitated the sounds of some animals and musical instruments vividly. He mainly imitated the sounds.

3. The frequency of sound that people can feel has a certain range. The frequency range of sound that most people can hear is about 20-20,000 times per second. People call sounds lower than 20 times per second infrasound, and sounds higher than 2000 times per second called ultrasonic waves. The "voice" that elephants use to communicate is a kind of infrasound wave. Humans cannot hear the "voice" of elephants because ( )

A. The sound the elephant makes is too quiet

B. Infrasound waves cannot reach the human ear

C. The frequency of infrasound waves is greater than 20,000 times per second

D． The frequency of infrasound waves is less than 20 times per second and is not within the range of human hearing.

4. When playing the same piece of music, people can distinguish the sounds produced by the erhu and the violin, mainly because of their ( )

A. Different loudness B. Different pitch

C. Different timbre D. Different rhythm

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Update Time: 2024-06-30

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

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