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Periodic Phenomena
Kundt's tube with analog outputs
Ref : 22204
7.2
The simplest example is not experimentally accessible because it is difficult for the
loudspeaker to generate the corresponding frequency of N = 173 Hz.
We thus select the following standing state obtained when the LFG is adjusted to 519 Hz.
The Généris screen grab has the following appearance
The diagram of the tube given above represents the distribution of pressure nodes and
antinodes in the sound tube. It corresponds well to the theoretical distribution. The
modelling carried out accurately defines the positions of the maxima and minima.
The modelled curve corresponds to the function: U
numerical values we obtain:
ENGLISH
Case when the pipe is closed
V
V
N
V
U
th
•
= 1.52 is very close to /2 giving for the function U ≈ 0.617.abs(cos 2..d/6,76)
•
= 6.62 dm gives a wave length of 0.662 m
•
To deduce the speed of sound at ambient temperature, we express v=N.
:
N
V
N
th
= 0.617.abs(sin 2..d/6.62+1.52)
23
V
N
V
= a.abs(sin(2.d/+)). With the
N
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