sound and science

1. SOUND and
WAVES

2. SOUND and MOVEMENT
Sound is
generated by
a movement
like shaking
your hands or
blowing into
your
instruments

3. In this photo we can see that waves of the sea have the same
structure as sound waves.

4. TRANSVERSE AND
LONGITUDINAL WAVES

5. 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.

6. 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.

7. ●
http://phet.colorado.edu/sims/wave-on-a-string/wav

8. Wavelenght and Amplitude
●
λ(lambda)=
wavelenght=
distance
between the
two nearest
peaks
●
A=amplitude=
distance
between the
peak and the
orizontal line

9. FREQUENCY
●
Frequency is the
number of peaks in
the unit of time, i.e.
one second
Inserire grafico

10. Pure sound
Complex sound

11. 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

12. ●
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

13. ●
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