"The Propagation of Sound" Various Sound PPT Courseware 3

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"The Propagation of Sound" Various Sound PPT Courseware 3

propagation of sound

01 How does sound reach our ears?

02 Will the sound change during the propagation of sound?

03 How does a vibrating tuning fork cause fluctuations in the water surface?

04 How does the sound get from one end of the "earth phone" to the other end?

05 Does sound propagate the same in different objects?

Vibrating objects and sound waves

We have seen the vibrations of the tuning fork cause ripples in the water when a struck tuning fork is lightly touched upon the surface of the water.

So, how does a vibrating tuning fork cause fluctuations in the water surface?

Observe this experiment again and share your thoughts with your classmates.

Explanation: Sound can travel in liquids

How does sound get from one end of the "earth phone" to the other?

1. Use two paper cups as the microphone and receiver, and a cotton or nylon wire about 5 meters long as the phone line to make a "home phone".

2. Straighten the "telephone line", one student speaks quietly into the microphone at one end of the line, and another student answers with the receiver at the other end of the line.

3. Then, exchange listening and speaking with each other

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

Explanation: Sound can propagate through solids

Does sound propagate the same in different objects?

1. Prepare a piece of aluminum foil and fold it lengthwise several times to make a straight aluminum foil ruler; a wooden meter ruler, cotton thread, nylon rope, etc. The lengths of these materials are the same, 1 meter long.

2. First predict whether the propagation effect of sound will be the same in aluminum foil, cotton thread, nylon rope, and wooden meter stick.

3. Which material does sound transmit best through?

4. Conduct experiments

Note that one end of each material must be connected to the tuning fork. Find a classmate to listen to the material at the other end. Pass the vibrating tuning fork through aluminum foil, cotton thread, nylon rope, wooden meter stick and other objects, carefully listen and feel the vibration of the tuning fork, and compare the differences in the sounds transmitted by these objects.

Air is an important material for transmitting sound. What would happen if the air was removed from the glass cover and it became a vacuum?

Phenomenon: We only see the alarm clock moving but cannot hear the sound.

What would it be like on the moon?

Since there is no air on the moon, that is, there is no material that can transmit vibrations, two people cannot talk to each other even if they are not far apart, and must use radio equipment.

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Update Time: 2024-10-02

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