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3B SCIENTIFIC
Instruction sheet
10/07 ALF
1. Safety instructions
•
Store the glass tube in a safe place where it
cannot be exposed to danger of shocks or
breaking.
•
Do not expose the glass tube to any mechani-
cal stress or strain.
•
Do not bend the movable piston while pushing
it in or pulling it out.
•
Do not use the apparatus, if even the slightest
damage is discovered on the glass tube.
•
Protect the apparatus from humidity and dust.
2. Description
By employing cork dust, a Kundt's tube is used to
demonstrate the distribution of nodes and anti-
nodes in a standing sound wave. Using the appara-
tus, it is also possible to demonstrate that standing
waves are formed when a resonance condition is
fulfilled for sound wavelength λ and length s of the
vibrating air column in the tube such that:
s = n λ/2 for reflected waves with antinodes at the
open end,
s = (2n+1)λ/4 for reflected waves with nodes
(n = 1, 2....n) at the closed end.
®
PHYSICS
Kundt's tube U8432845
1
1 Movable plunger
2 Kundt's tube
3 Cork powder
4 Stand (not included)
5 Refill rail
The wavelength can be determined from the num-
ber of nodes n and the distance a between the first
and last nodes
λ = 2a/(n − 1).
The rod with the cork plunger seals the tube and is
used for changing the effective tube length to tune
the frequency of the resonant sound waves.
A whistle, a tuning fork or a loudspeaker driven by
a function generator can be used as a sound
source.
A funnel-shaped horn reduces the wave impedance
at the opening of the tube. As a result, more sound
energy can be introduced into the tube.
2.1 Scope of delivery
1 Glass tube
1 Movable piston
1 Horn
1 Whistle
1 Refill rail
3. Technical data
Tube:
Internal diameter:
Glass thickness:
Movable plunger:
600 mm
17 mm
1.5 mm
280 mm x 3 mm dia.
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