"Changes of Sound" Sound PPT Courseware 2

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"Changes of Sound" Sound PPT Courseware 2

Thinking: Why do some sounds sound high-pitched and some sound low-pitched?

I see

The intensity of sound is described by volume. Volume is a quantity that describes the amplitude of the vibration of an object. The unit is: decibel (dB). The greater the vibration amplitude, the stronger the sound; the smaller the vibration amplitude, the weaker the sound.

Observe and compare the changes in the sound pitch of four cups containing different amounts of water.

1. If these 4 cups are hit with the same force, predict the difference in the sounds they make?

2. Use the words high, high, low, and low to describe their changes.

3. Fill in the record form.

The level of sound is described by pitch. Pitch is a quantity that describes how fast an object vibrates. The unit is: Hertz (Hz). The faster the vibration, the higher the sound, the smaller the vibration, the lower the sound.

2. Ultrasound and infrasound

The frequency range that most people can hear ranges from 20HZ to 20,000HZ. People call sounds higher than 20000HZ ultrasonic waves, and sounds lower than 20Hz called infrasound waves.

Thinking: Why do dogs suddenly act very alert when we think it is quiet and without any sounds?

Why does a person's voice change when he has a cold?

The nasal cavity is a resonance system of the human body. Since the nasal cavity and sinuses are structurally a whole, the sinuses can be compared to the resonance box of a violin or huqin. Having a resonance box can make the sound pleasant and harmonious. On the contrary, if you have sinus diseases during a cold, your "resonance box" function will be lost, and the pleasant sound will change.

Why does the sound get louder and louder when I pour water into the thermos bottle?

When pouring water, the air column in the thermos bottle will vibrate. As the water level rises, the air column becomes shorter and shorter. The frequency of the air column vibration becomes larger and larger, and the pitch becomes higher and higher. Therefore, according to the pitch of the sound, You will know if the water is full.

Want to discuss

Because each person's voice is so different, the voice can be used as one of the basis for security authentication. An intelligent building in the United States uses voice recognition. When you arrive at the gate of a large company, you must pass a security check. The electronic voice-activated doorman will greet you with "Good morning," and you should respond with polite phrases such as "Hello!" or "Good morning." At this time, the electronic doorman will use your voice to identify whether you are a staff member of the company. If it is confirmed that you are, it will take the initiative to open the door for you, but if not, the electronic doorman will politely "turn you away."

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"Changes of Sound" Sound PPT Download:

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"Changes of Sound" Sound PPT:

"Changes in Sound" Sound PPT Part 1: Observe and compare changes in sound intensity. Make part of a steel ruler or plastic ruler extend out of the table about 10 to 12cm. Use one hand to hold one end of the ruler, and the other hand to move the other end of the ruler. First gently move...

"Changes of Sound" Sound PPT Courseware 5:

"Changes in Sound" Sound PPT Courseware 5 Comparative Experiment 1: Observe and compare the changes in sound intensity Requirements: Take a steel ruler or part of a plastic ruler and extend it about 10-12 cm from the table. Press one end of the ruler with one hand and dial the other end of the ruler with the other hand. ..

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Update Time: 2024-07-03

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