Pasco Scientific WA-9612, Инструкция по эксплуатации и руководство по экспериментам, Страница: 23 / 28

19
012-03541F Resonance Tube
Teacher’s Guide
Experiment 1: Resonant Frequencies of a Tube
Notes on Procedure
➅
The fundamental frequency for the closed tube with
the piston in the very end (longest possible closed
tube) is about 95 Hz. Because it is difficult to see
the resonance at such a low frequency, you may
want to make sure that the piston is inserted to at
least the 70cm mark.
Notes on Analysis
O p e n t u b e O p e n t u b e
O p e n t u b e O p e n t u b e
O p e n t u b e C l o s e d t u b e C l o s e d t u b e
C l o s e d t u b e C l o s e d t u b e
C l o s e d t u b e
v v/vo v v/vo
185 1.00 94 1.00
369 1.99 282 3.00
555 3.00 473 5.03
740 4.00 663 7.05
918 4.96 852 9.06
1102 5.96 1042 11.09
1271 6.87 1230 13.09
1369 7.40 1434 15.26
1676 9.06 1626 17.30
1870 10.11 1812 19.28
2056 11.11 2006 21.34
There will be some data points which seem to be
resonant, but aren’t at the theoretical resonant
frequencies (Italicized points on the “open tube”
data above, for example. On the whole, however,
the data should be fairly close to theoretical.
Notes on Questions
The open-tube number series (1,2,3,4...) contains
consecutive integers. The closed-tube series
(1,3,5,7...) contains odd integers. This series is a
series of the values of n: see theory section.