Jeulin 222 044 Mode D'emploi page 23

Periodic Phenomena
Kundt's tube with analog outputs
Ref : 22204
The modelling with the numerical results indicated below gives the following wave length:
Which corresponds to the speed of sound of:
That is a relative difference of 0.02 % with the theoretical value.
2. We then select k = 4, therefore N = 1392 Hz.
The recording is done in the same conditions and the following graph is obtained:
The experimental result still coincides well with the predictions: presence of four antinodes
and five nodes in the pipe. We still notice a discrepancy of the standing system towards
the right, by about 2 cm.
The modelling with the numerical results indicated below gives:
Which corresponds to the speed of sound of:
That is a relative difference of 0.6 % with the theoretical value of 346 m.s
Other values can be selected. We obtain results that are compliant with the theoretical
values. It is advisable to limit the number of maxima so as to maintain a readable recording.
ENGLISH
 = 0.497 m
v = N. = 696 x 0.497 = 345.9 m.s
V N V
N V N
V
V N
 = 0.247 m
v = N. = 1392 x 0.247 = 343.8 m.s
22
-1
,
N V N V
N N
V V
V
-1
,
-1
.
N
N
N