Wb-3 The Gas Tube
Published: Tuesday 14 March 2006 - Updated: Thursday 19 April 2007
Aim
To demonstrate standing wave patterns in a pipe using sound waves and gas jets to indicate the pressure profile.
Apparatus
- Horn Loudspeaker
- Signal Generator
- Minilab
- Kundt's Dust Tube
Diagrams
Click on pictures to enlarge.
|
Videos
Gas Tube |
Description
A metre long pipe has a series of small holes drilled equidistant along its length and is connected to a natural gas supply. At the other end a horn loudspeaker is driven by the Minilab signal generator and power amplifier combination. The gas supply is adjusted to give a flame height of approximately 2 inches.As the frequency is varied , standing waves are produced, pressure maxima and minima are formed in the pipe, as indicated by the height of the flames.
The following frequencies produced the indicated modes.
|
frequency (Hz) |
Mode (Number of wavelengths) |
|
200 |
1/4 |
|
400 |
1/2 |
|
800 |
1 |
|
1600 |
2 |