PASCO WA-9495 User Manual

®

Economy Resonance Tube

WA-9495

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Instruction Sheet

012-08340B

Included Equipment Part Number

1. Economy Resonance Tube Set WA-9495

2. Feet (2 pieces) 648-08278

3. Plug 740-09890

Additional Equipment Recommended

Open Speaker WA-9900

Driver for Speaker:

Sine Wave Generator WA-9867

Digital Function Generator WA-9587C

or

GLX Power Amplifier PS-2006

Introduction

The Economy Resonance Tube is designed for the study of reso­nance in a column of air. The tube set includes an outer tube and
an inner tube with a scale and a removable plug. The length of the
air column is adjusted by moving the inner tube. When the plug
is in place, the tube is closed at one end. Without the plug, the
tube is open at both ends. There are two rows on the scale: one
for measuring the resonating length when the plug is in place and
one for when the plug is removed.

L

(a)

Plug

L

(b)

With plug

(c)

Speaker

Without plug

Feet

Sine Wave Generator

Figure 1: Set-up

Figure 2: (a) Closed-end tube with plug in place

(b) Open-end tube with the plug removed

(c) Closed-end length is measured on top scale;

open-end length is measured on the bottom scale

800-772-8700 www.pasco.com

Economy Resonance Tube WA-9495

The tube is driven by a speaker. The PASCO Open Speaker
(WA-9900) is recommended because it does not have a resonat­ing box that would resonate at different frequencies from the
tube. The speaker can be driven by the Sine Wave Generator
(WA-9867) or other suitable function generator.

When the tube is driven at a resonant frequency, the sound is
louder.

Set-up

• Set up the equipment as illustrated in Figure 1 either with or
without the plug.

• If the plug is installed, it must be on the end of the inner tube
closest to the speaker (Figure 2a).

• Position the speaker at a 45° angle to the tube and several
centimeters from the end.

• To remove or replace the plug, push the inner tube all the
way in so it comes out at the speaker-end (Figure 3).

Open and Closed Tubes

1. Do the constant-frequency experiment with a closed tube.

2. Repeat the experiment with the same frequency and an open

tube.

3. Find the relationship between the closed-tube and open-tube
resonant lengths.

Specifications

Outer tube length 1.3 m

Figure 3: To remove or replace plug

Suggested Experiments

Constant Frequency, Variable Length

1. Set up the apparatus as a closed tube (with the plug), or an
open tube (without the plug). Push the inner tube all the way
in so that the resonating length is at its minimum.

2. Drive the speaker at a constant frequency.

3. Slowly increase the length of the tube. Note the lengths at

which resonance occurs.

Constant Length, Variable Frequency

1. Set up the apparatus as a closed tube (with the plug), or an
open tube (without the plug). If it is a closed, the resonating
length should be at least 50 cm.

2. Start driving the speaker at 50 Hz.

3. Slowly increase the frequency. Note the frequencies at which

resonance occurs.

Inner tube length 1.3 m

Diameter 0.15 m

Technical Support

For assistance with any PASCO product, contact PASCO at:

Address: PASCO scientific

10101 Foothills Blvd.
Roseville, CA 95747-7100

Phone: [phone] (worldwide)

800-772-8700 (U.S.)

Fax: [phone]

Web: www.pasco.com

Email: [e-mail]

Limited Warranty For a description of the product warranty, see the
PASCO catalog.
Copyright The PASCO scientific 012-08340B

Tube Instruction Sheet

is granted to non-profit educational institutions for reproduction of any part
of this manual, providing the reproductions are used only in their laborato­ries and classrooms, and are not sold for profit. Reproduction under any
other circumstances, without the written consent of PASCO scientific, is
prohibited.
Trademarks PASCO, PASCO scientific, and Xplorer GLX are trade­marks or registered trademarks of PASCO scientific, in the United States
and/or in other countries. All other brands, products, or service names are
or may be trademarks or service marks of, and are used to identify, prod­ucts or services of, their respective owners. For more information visit
www.pasco.com/legal.

is copyrighted with all rights reserved. Permission

Economy Resonance

®

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