Holmarc’s Kundt’s tube apparatus (Model No: HO-ED-A-02) is a device for measuring the speed of sound. Any waves traveling along the medium will reflect back when they reach the end creating a standing wave allowing harmonics to be identified. Nodes occur at fixed ends and antinodes at open ends. Furthermore, it provides an insight into the interesting phenomenon of standing sound waves.
In this experiment the amplitude of the sound wave can be observed at different locations in the tube, allowing a half wave length to be measured between an adjacent maximum and minimum.
Here, one-side closed cylindrical transparent pipe filled with air is used as a resonator. One end of the tube is attached with a loudspeaker where as the other end is fixed with a movable piston with reflector and a microphone. An AC voltage applied to the loudspeaker, tunes the membrane to vibrations that are transferred to the gas or air column. Frequency can be changed by enlargement or diminishment of the glass cylinder as well as by changing the frequency of the generator.
Experiment
► To find the velocity of sound in air with the help of head phone
► To find the velocity of sound in air using Lissajous Figures
Specifications
► Transparent solid tube, 59 mm dia x 1000 mm long
► End housing fixed with 2” speaker for creating the sound waves
► Piston on a long rod to create variable length closed tubes
► Driver unit to interface the microphone to an amplifier or oscilloscope
Model No. HO-ED-A-02
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