"Characteristics of Sound" Sound Phenomenon PPT Courseware 11

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"Characteristics of Sound" Sound Phenomenon PPT Courseware 11

learning target

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 controlled variable method to design experiments and experience the process of scientific inquiry.

2. I want to briefly understand the relevant knowledge of frequency, ultrasonic waves, and infrasound waves.

3. I can know the different timbres produced by different sound emitters, and feel the magic and harmony of the sound world.

Research activity one

Ask the question: What factors are related to the pitch of the sound?

My guess is that the pitch of the sound may be related to the speed of the vibration

Experimental program

1. Experimental steps:

①Press the steel ruler ___ on the table so that one end protrudes from the edge of the table. (Pay attention to where you hold your hand)

② Turn the steel ruler to make it vibrate and make sound.

③Change the steel ruler to __________ and turn the steel ruler again.

2. Compare the _____ of the steel ruler’s vibration and ____ of the sound in the two situations.

3. Pay attention to ____________________ during operation (control variable method)

Collaborate to explore the relationship between the pitch of sound and the speed of vibration.

Conclusion The faster the sound generator vibrates, the higher the pitch of the sound.

[Autonomous learning]

1. In physics, ____________ is called frequency, which is used to describe the _____ of the vibration of an object. Unit ____, abbreviated as ___, symbol ___.

2. The human vocal frequency is approximately __________, and the hearing frequency range is __________.

3.____________ is called ultrasonic wave; ____________ is called infrasound wave.

4. On the eve of an earthquake, dogs often bark frequently, but people don’t feel anything. This abnormal phenomenon shows that ( )

A. Dogs can emit infrasound waves with the same frequency as seismic waves

B. The hearing range of dogs’ ears is wider than that of humans, and they can hear infrasound waves that human ears cannot hear.

C. Human ears cannot hear seismic waves because they are ultrasonic waves.

D. Seismic waves cannot be felt by human ears because no infrasound waves are generated.

[Tracking Exercise 1]

1. To make the sound produced by the erhu higher in pitch, the method that should be adopted is ( )

A. Pull the string tighter B. Relax the string

C. Increase the length of the sounding part D. Play the piano with greater force

2. The "B-ultrasound" machine uses ultrasound waves to diagnose conditions, but people cannot hear the sound it makes. This is because ( )

A. The sound is too loud b. volume is too low

C. The frequency of sound is greater than the frequency that humans can hear the sound

D． The frequency of sound is smaller than the frequency that humans can hear

Research activity two

Ask a question: What factors are related to the loudness of sound?

My guess is that the loudness of the sound may be related to the amplitude of the sound emitter

Experimental program

1. Experimental steps:

① Use a small hammer to hit the tuning fork to make it vibrate, listen to the sound made by the tuning fork, and observe the extent of the bounce of the ball.

② Use a small hammer to hit the tuning fork to make it vibrate, listen to the sound made by the tuning fork, and observe the extent of the bounce of the ball.

2. Compare the _____ of the ball being bounced twice and the ____ of the sound.

3. Pay attention to the problem: Use ____ tuning fork to only change the amplitude of the sound emitter (control variable method).

Collaborate to explore the relationship between the loudness of sound and the amplitude of the sound emitter.

Conclusion: The greater the amplitude of the sound emitter, the louder the sound.

[Tracking Exercise 2]

1. The sound of thunder "deafening" refers to the ______ loudness of the sound.

2. When people speak loudly to a distance, they often use their hands to form a trumpet shape around their mouth. This is for ( )

A. Increase speaking frequency

B. Increase the loudness of the sound reaching the other party’s ears

C. Change the timbre of speech

D. Increase the speaker’s lung capacity and make it easier for the person to speak

[Tracking Exercise Three]

Xiao Shenyang imitated the voice of singer Daolang in the 2009 Spring Festival Gala sketch "Not Short of Money", and the audience felt very similar. From a physical point of view, Xiao Shenyang mainly imitated Daolang's singing voice ( )

A. Speed ​​of sound b. Tone c. Loudness D. timbre

Test in class

1. "The tenor is singing loudly", the two words "gao" in this sentence, the first refers to _____ high, and the second refers to ______ big.

2. The voiceprint lock is a magical lock. As long as the owner speaks a preset code word, the lock can be opened. Others cannot open the lock even if they speak the code word. The main basis for this voiceprint lock to identify sounds is ( )

A. Pitch B. Loudness C. Timbre D. Speed ​​of sound

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Update Time: 2024-09-06

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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