® I n s tr u c t i o n S he e t

0 1 2 - 0 8 3 4 0 B

Economy Resonance Tube

WA-9495

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Included Equipment

1.

Economy Resonance Tube Set

Part Number

WA-9495

2.

Feet (2 pieces)

3.

Plug

Additional Equipment Recommended

648-08278

740-09890

WA-9900 Open Speaker

Driver for Speaker:

Sine Wave Generator WA-9867

WA-9587C Digital Function Generator or

GLX Power Amplifier PS-2006

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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

Speaker

(c)

Without plug

Feet

Sine Wave Generator

Figure 1: Set-up

800-772-8700

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 www.pasco.com

E c o n o m y R e s o n a n c e T u b e W A - 9 4 9 5

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.

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.

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).

Specifications

Outer tube length

Inner tube length

Diameter

1.3 m

1.3 m

0.15 m

Technical Support

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.

®

For assistance with any PASCO product, contact PASCO at:

Address: PASCO scientific

10101 Foothills Blvd.

Roseville, CA 95747-7100

Phone: 916-786-3800 (worldwide)

800-772-8700 (U.S.)

Fax:

Web:

(916) 786-7565 www.pasco.com

Email: [email protected]

Limited Warranty For a description of the product warranty, see the

PASCO catalog.

Copyright The PASCO scientific 012-08340B Economy Resonance

Tube Instruction Sheet is copyrighted with all rights reserved. Permission 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.

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