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Voici un exo physique en anglais !
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Blue Man Group is an art company worldwide known
since its formation during the late eighties. Their shows
combine a lots of different categories of music, art
and technologies. One of their musical instrument is
called the tubulum. It is formed by the combination of
several PVC tubes. They strike the ends of tubes with
soft spatulas to get different notes.
The pitch of the sound is related to the length of the
association of the tubes by the relation f= where v
2xl
is the value of the speed of sound propagation in the air.
The graph below shows the recording of a sound signal
with an intensity of level L = 70 dB, produced by this
instrument.
AU(in V)
hay hand
(in ros)
1 ms
Data
Under the conditions of the exercise, v = 343 m-s¹,
The propagation speed increases with temperature.
1. Identify the transmitter of sound signal.
2.a. Determine the pitch of the sound signal produced.
b. Deduce the length of the tube constituting the
instrument.
3. How could the length of the tube vary if the musi-
cian wanted to emit the same note as before while the
temperature of the concert hall increased?
4. Explain why the perceived sound would be different
if a flutist played the same note.
5. Could the sound emitted by the tubulum present a
danger for the musicians?