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"The Propagation of Sound" Sound PPT Download
Part One: Vibrating Objects and Sound Waves
Sound is produced by objects ( ).
Strike the tuning fork and it will vibrate
So does the air around it vibrate too? What can be done to prove it?
1. Strike the tuning fork.
2. Touch the tuning fork lightly to the water surface and observe the phenomenon on the water surface.
Note: When placing the tuning fork on the water, wait until the water surface is calm; tap the tuning fork gently, and at the same time gently touch the tuning fork to the water after tapping.
Experimental phenomena
The water surface slowly spreads out from the center of the tuning fork to the surrounding areas.
So how does a vibrating tuning fork cause fluctuations in the water surface?
When the sound source vibrates, the surrounding air will also vibrate. The vibration of the tuning fork is transmitted into the water through the air.
Propagation of sound PPT, part 2: propagation of sound in different objects
Predict first
Does sound propagate the same through these objects? Which object does sound travel best through? Tell us your reasons.
Experiment again
One student holds the handle of the vibrating tuning fork at one end of the object so that the tuning fork is in contact with the object or wraps one end of the object around the tuning fork. The other student holds the other end of the object close to the ear and tightens the object. The student holding the tuning fork should try to hit the tuning fork with the same strength. The student on the other end must listen carefully and then record what they heard during the experiment on the "recording sheet of sound propagation in different objects"
group work
Think: Can you hear the sound of the tuning fork through all the materials?
Which material did you find that sound travels best through (loudest)?
Propagation of Sound PPT, Part 3: Classroom Exercises
1. Judgment questions
1. The propagation speed of sound in air at 15℃ is 340 meters per second. ( )
2. The propagation speed of sound in wooden rods and steel bars is different. ( )
3. On a thunderstorm day, we will first hear the rumble of thunder, and then see the bright lightning. ( )
2. Multiple choice questions
1. Different materials have different propagation speeds of sound. Among solids, liquids and gases, when sound passes through, ( ) propagates the fastest and ( ) propagates the slowest.
A liquid B solid C gas
2. The repairman of the train track judges whether the track is faulty by putting his ear on the track and listening to the knocking sound. This is because ( ).
A solid can propagate sound, and the propagation speed is fast
BThe speed of sound propagation in solids is smaller than the speed of propagation in gases
C Broken rails will not transmit sound D None of the above answers are correct
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