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on 30 May 2016

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Transcript of 3. SOUND

Vocabulary (page 64 and 65)
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Sound is made of vibration
Vibrations can be transmitted, bounded or absorbed by particles.
If it is transmitted,there is sound

Particles crash with each other
Energy is lost in each crash
Speed is faster in the crashes
Speed is slower between crashes

Is there energy if there if there aren´t particles
Can the sound energy be transmitted in the vacuum?
Where is the speed of sound faster, in the water or the air? Why?
The speed of sound
Air: 340m/s
Water: 1500m/s
Iron: 5000m/s
What medium is the best for a long transmition?
What is the medium is the best for a fast transmittion?
Echo and reverberation
Some materials reflect the sound energy
2 sounds
In less than a second: reverberation
More than a second: echo
Same sounds in less than a second
More sound = Reverberation
Same sounds in more than a second
Double sound = echo
Hair needs 1 second to recover the initial position
Main ideas
What is sound?
Where can sound waves travel?
Why the speed of sound is different depending of the medium.
What is the difference between echo and reverberation.
Define intensity, pitch and timbre of a sound?
In what unit can we measure pitch, timbre and intensity?
Expline the difference between noise and music.
What is acustic contamination?
Full transcript