"Characteristics of Sound" Sound Phenomenon PPT

Description

"Characteristics of Sound" Sound Phenomenon PPT

Part One: Preview Perception

1. Tone

1. Concept.

_________ of sound.

2. Influencing factors.

Object ______________: The object vibrates ________ with a pitch of ________.

3. Frequency.

(1)Definition: The number of times an object vibrates in ________.

(2) Meaning: reflects the _________ of the vibration of the object, the _________ of the object's vibration, and the frequency ________.

(3) Unit: ________, symbol: Hz.

4. The relationship between pitch and frequency.

The higher the frequency of the vibration of an object, the pitch of the sound is ________; the lower the frequency, the pitch of the sound is ________.

5. Sound waves.

(1) Audible sound: The frequency range is ______________.

(2) Infrasound: sound with frequency ______________.

(3) Ultrasound: sound with frequency ______________.

2. Loudness

1. Concept.

The sound of ______________.

2. Influencing factors.

(1) _________ of the object: the amplitude of the object___________, and the loudness___________.

(2) _________ distance from the sounding body: _________ distance from the sounding body, loudness ________.

(3) Speakers can reduce the _________ of sound and make it travel farther.

3. Tone

1. Influencing factors.

________, ________, etc. of the sounding body.

2. Methods of distinguishing timbre.

Using the ________ distinction of sound, even if the pitch and loudness are the same, as long as the timbre is different, the waveform will be different.

Characteristics of Sound PPT, Part 2: Interactive Classroom Understanding

Understanding of pitch, loudness, and timbre

1. Understand pitch, loudness, and timbre from the perspective of vibration.

2. Loudness and pitch are two different characteristics of music. A high-pitched sound does not necessarily have a loudness; a high-pitched sound does not necessarily have a high pitch.

3. During the propagation process of sound, the pitch and timbre generally remain unchanged, but the loudness will change with the change of propagation distance.

4. The pitch of the sound is determined by the frequency of the object's vibration, and the frequency of the object's vibration is determined by the length, thickness, thickness, tightness, size, etc. of the object.

5. Due to different materials, structures, etc., the sounds emitted by different objects will have different characteristics, that is, different timbres.

[Example] If you press the same key of the piano with different amounts of force, the different sounds produced are ________; if you play different keys of the piano with the same force, the different sounds produced are ________; if you play with the same force, the sounds produced will be different. The difference in the sound produced by the piano in the key of C 4 and the violin in the key of C 4 is ________. (Please fill in "pitch", "loudness" or "timbre").

Tip: In physical language, the "high" and "low" of a sound are only used to describe the pitch, and the "strong" and "weak" of the sound are only used to describe the loudness. Therefore, pitch and loudness are two completely different concepts. A high-pitched sound is not necessarily loud, and a loud sound is not necessarily high-pitched.

Analysis: Pianos and violins both produce sound through the vibration of strings. Pressing different keys on the piano can produce different tones; pressing the same key on the piano with different amounts of force can produce sounds with different loudness; making pianos and violins Different materials produce different timbres.

Answer: loudness, pitch, timbre

Characteristics of Sound PPT, Part 3: Try Application

1. Tone

1. (2018·Yunnan Yuxi Simulation) The picture below is an experimental device to explore the factors that affect pitch. Which of the following statements is incorrect ()

A. Change the frequency of vibration of the steel ruler by changing the length of the steel ruler extending out of the table

B. In multiple experiments, the amplitude of the vibration of the steel ruler was kept the same and the control variable method was used.

C. The longer the steel ruler extends out of the table, the faster it vibrates.

D. The object vibrates quickly, the frequency of vibration is high, and the sound it emits is high-pitched.

2. As shown in the picture, take a hard card and let it slide across the teeth of the wooden comb, one time faster and one time slower. The characteristic quantity of the sound that changes obviously is ________, which means that the characteristic quantity is related to the sound produced. Relevant to the _________ of body vibration.

When a hard card is moved at different speeds, the card vibrates at different speeds and the pitch of the sound heard is different. Therefore, the experimental phenomenon shows that the pitch is related to the frequency of the vibration of the sounding body.

2. Loudness

3. In the physical education class on the playground, the students nearby heard the command given by the physical education teacher, but the students far away did not hear it clearly. The reason is ()

A. The sound heard by students in the distance is small

B. The sound heard by students in the distance is loud

C. The sound vibration amplitude heard by students in the distance and near is the same.

D. The sound heard by students in the distance has a large vibration amplitude

4. In order to call someone in the distance, Xiaoxin used his hands to form a trumpet shape and put it to his mouth, as shown in the picture. This is done for ()

A. Increase the frequency, thereby raising the pitch of the sound

B. Increase the amplitude, thereby increasing the loudness of the sound

C. Enable people further away to distinguish whose voice it is

D. Reduce the dispersion of sound and increase the loudness

5. As shown in the picture, put some foam balls on a loudspeaker that is sounding, and gradually increase the volume of the loudspeaker, you will see ____________________. This experiment shows ____________________.

3. Tone

6. In some "imitation show" TV programs, when performers imitate singers' singing, they mainly imitate the singer's voice ()

A. Loudness B. Pitch C. Timbre D. Frequency

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Update Time: 2024-11-02

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

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