"Who Can Spread the Sound" PPT courseware

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"Who Can Spread the Sound" PPT courseware

Part One: Propagation of Sound

When the alarm clock rings, how does the ringtone reach your ears?

--Air

Use a trumpet and a candle to demonstrate how sound travels through the air.

When the sound source is not vibrating, the surrounding air is not vibrating either.

When the sound source vibrates, the surrounding air also vibrates. The vibration of the surrounding air can be seen through the candle flame.

Experimental investigation: Can liquids transmit sound?

Set the alarm clock to sound after 1 minute → Put it in a plastic bag → Put it into the water → Put the water pipe into the water → Do you hear the alarm sound?

Sound can be transmitted through all gas, liquid, and solid materials as media. These materials as transmission media are often referred to as media for short.

Sound travels through media. Sound cannot travel in a vacuum.

Sound spreads in the form of waves. When sound waves encounter an object, it causes the object to vibrate. This is how sound spreads from one place to another through various materials.

Part Two: Practice Questions

1. Regarding "sound", which of the following statements is wrong ( )

A． Sound is produced by the vibration of objects

B. Sound can travel in water

C. Sound can travel in a vacuum

D. Sound can weaken as it travels

2. Regarding the phenomenon of sound, which of the following statements is correct: ( )

A. Sound propagates at the same speed in different media;

B. People speak by vibrating the tongue to produce sounds;

C. As long as the object is vibrating, our human ears can hear the sound;

D. All sound-producing objects vibrate.

3. Among the following statements about sound phenomena, which one is wrong ( )

A． Pleasant singing is produced by the vibration of the singer's vocal cords

B. Sound propagation requires a medium, and sound cannot be transmitted in a vacuum

C. Sound travels faster in solids than in air

D. Sound propagates at the same speed in various media

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Update Time: 2024-11-02

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