AIM

To find the velocity of sound waves in a given rod with Kundt's tube apparatus.

For showing the wavelength of vibrations in air in a closed tube, by  the  depositing Thermo Cole balls at the nodes

Our apparatus, commonly known as Kundt's Tube, was originally designed to measure the velocity of sound as it travels through a variety of substances.  It is built using an acrylic tube that is closed at one end with a sound source at the other end.  The tube lies horizontally and the substance being tested is put into the tube.  When the sound source is activated, stationary waves can be observed in the substance.  The wavelengths change according to the frequency of the sound. 

Hypothesis:

                     We believe that since the sound waves are reflected off the closed end of the tube, the opposite waves colliding creates the raised columns.  Since sound waves are longitudinal (that is, they are made up of alternating areas of high and low pressure), then when the waves collide, they create areas of intensely high and low pressure, pushing the styrofoam balls into columns in the shape of the wave.

SPECIFICATION

• Construction One meter long 38/50 mm x 100 cm Perspex Transparent tube, fitted on a Laminated Board.
• TUBE it is closed with cork from one side and the other side is connected to a SPEAKER  with a cub shape tube.
• SPEAKER it is connected with a amplifier to adjust the volume with provison to give different frequencies through MOBILE or any frequency producing device
• NOTE the frequency producing device not provided with the instrument.
• A Function Generator can also be used
• Thermocole balls Small ball are provided and inserted in the tube, which forms different shapes when different frequencies are given.