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Authoritative PPT Summary
"Characteristics of Sound" Sound Phenomenon PPT Courseware 5
review
1. How is sound produced?
Sound is produced by the vibration of objects.
2. What are the three types of media that transmit sound?
Solid, liquid, gas
3. What is the speed of sound in air at 15°C?
our feelings and feelings
The sounds we hear can be said to vary widely;
The sound of the trumpet is loud and straight;
The sound of the violin is soft and delicate;
The sound of the cello is steady and stretched...
They are strong or weak, high or low, some rich and some crisp. After listening to this music, we will be immersed in the enjoyment of beauty.
musical sound
Sounds that are harmonious and pleasant to the human sense of hearing are called musical sounds. Musical sound is a sound wave produced by the regular periodic vibration of an object. Different musical sounds can be distinguished by their three characteristics: pitch, loudness, and timbre. Therefore, pitch, loudness and timbre are also called the three elements of music.
1. Tone
Pitch refers to the pitch of a sound.
Activity 1
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.
When the length of the steel ruler extending out of the table is gradually increased, the steel ruler vibrates _______ (fill in "faster", "slower" or "unchanged"), and the pitch of the sound emitted by the steel ruler's vibration will gradually change _______.
Activity 2: Pass the cardboard across the teeth of the comb, the first time slowly and the second time faster. Pay attention to the difference in the pitch of the sound produced by the two vibrations.
Think about: Which time did the sound have a higher pitch?
Experimental conclusion: When the paper is crossed faster, that is, when the cardboard vibrates quickly, the pitch is higher.
Ultrasonic applications
① Ultrasonic inspection
Ultrasound imaging technology has been widely used in medical examinations.
② Ultrasonic treatment
Ultrasonic welding, drilling, crushing of solids, emulsification, degassing, dust removal, descaling, cleaning, sterilization, promoting chemical reactions and conducting biological research, etc.
③Ultrasonic mite removal
The auditory nervous system of mites is very fragile and is very sensitive to ultrasound at specific frequencies.
④Basic research
The characteristics and structure of materials can be explored through the absorption rules of ultrasound by materials.
Classroom testing
1. The pitch of the sound is called _______, which is related to the ______ of the vibration of the object.
2. The "deep" voice of a male student refers to the ____lowness of the male student's voice. This is because the male student's vocal cords vibrate more ____ when he speaks.
3. When Xiao Ming performs the erhu, he uses a bow to pull the strings to make the strings ______ and produce sound; Xiao Ming constantly uses his fingers to control the length of the strings in order to change the ______
4. Press a steel ruler firmly on the table, and extend one end of it by an appropriate length from the table. When you turn the steel ruler, you can hear the sound of the steel ruler vibrating. Gradually increase the length of the steel ruler extending out of the table, and the pitch of the sound produced by the vibration of the steel ruler will gradually become _____. When the steel ruler extends beyond a certain length from the table, although the steel ruler is vibrated with the same force, no sound is heard. This is because __________
5. Among the following experiments and examples, one group that can illustrate the conditions for the generation or propagation of sound is ()
①Put some scraps of paper on the drum surface, and you can see the scraps of paper beating continuously when you beat the drum; ②When the mobile phone placed in the vacuum cover receives a call, only the indicator light flashes and no ringing sound is heard; ③Take a Put a piece of cardboard and let it slide across the teeth of the wooden comb, once faster and once slower, and compare the difference between the two times; ④ Press the gong with your hand when the gong sounds, and the sound of the gong will disappear.
A. ①②③ B. ②③④
C. ①③④ D. ①②④
timbre
Refers to the quality and characteristics of sound.
Timbre is related to the material and structure of the sound source.
The timbre is generally judged based on the different timbres of people, animals, musical instruments, etc.
In conclusion:
Most of the sounds we usually listen to are pleasant to the ear. We call such sounds musical sounds; they have three characteristics (characteristics).
The pitch of the pitch is related to the vibration frequency
Loudness is related to amplitude and distance from the sound emitter
The timbre is related to the material and structure of the sound emitter
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"Characteristics of Sound" Sound Phenomenon PPT Courseware 11:
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"Characteristics of Sound" Sound Phenomenon PPT Courseware 10:
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"Characteristics of Sound" Sound Phenomenon PPT Courseware 9:
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