waves and sound
TRANSCRIPT
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SOUND and WAVES
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SOUND and MOVEMENT
Sound is generated by a movement like shaking
your hands or blowing into
your instruments
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In this photo we can see that waves of the sea have the same structure as sound waves.
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TRANSVERSE AND LONGITUDINAL WAVES
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SOUND AS LONGITUDINAL WAVE
● The sound is the alternation of compression and rarefaction of the air
● The uman being hears sounds between 20 Hz and 20000 Hz.
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Nowadays we can hear music under water. For example, in some sports, like syncronized swimming thanks to this instrument (photo) athletes can dance under water.
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● http://phet.colorado.edu/sims/wave-on-a-string/wave-on-a-string_en.html
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Wavelenght and Amplitude● λ(lambda)=
wavelenght= distance between the two nearest peaks
● A=amplitude= distance between the peak and the orizontal line
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FREQUENCY
● Frequency is the number of peaks in the unit of time, i.e. one second
Inserire grafico
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Pure sound
Complex sound
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THREE FEATURES OF THE SOUND
● PITCH● It depends on
frequency.● With a high
frequency you have a acue sound
● With a low frequency you thave a deep sound
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● TIMBER● It depends on the different
forms of the waves● When two musical
instruments play the same note, we perceive a difference in the sounds and it depends on the different timbers
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● INTENSITY● It depends on the waves energy● For example you increase the
intensity of a sound when you turn up the volume of your television or radio