SOUND and WAVES
SOUND and MOVEMENT
Sound is generated by a movement like shaking
your hands or blowing into
your instruments
In this photo we can see that waves of the sea have the same structure as sound waves.
TRANSVERSE AND LONGITUDINAL WAVES
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.
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.
● http://phet.colorado.edu/sims/wave-on-a-string/wave-on-a-string_en.html
Wavelenght and Amplitude● λ(lambda)=
wavelenght= distance between the two nearest peaks
● A=amplitude= distance between the peak and the orizontal line
FREQUENCY
● Frequency is the number of peaks in the unit of time, i.e. one second
Inserire grafico
Pure sound
Complex sound
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
● 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
● 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
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