KUNDT TUBE VIBRATION OF A ROD PDF

In a solid such as a metal rod, sound can be transmitted either by longitudinal or transverse waves. In this experiment, longitudinal sound waves will be produced in a metal rod and an air column. Using the properties of wave motion, the frequency of the sound and the speed of sound in the rod can be determined. The apparatus consists of a glass tube supported on a metal base as shown in the diagram. A clamp at one end of the base holds a metal rod which has a metal disk attached to one end.

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In a solid such as a metal rod, sound can be transmitted either by longitudinal or transverse waves. Using the speed of sound in air and the wave relationship , the frequency of the sound and the speed of sound in the rod can be determined. The apparatus consists of a glass tube supported on a metal base as shown in the diagram.

A clamp at one end of the base holds a metal rod which has a metal disk attached to one end. The rod and disk extend inside the glass tube, whose position can be adjusted to center the tube about the disk. It is important to make sure the disk is not touching the glass becuause the vibrations set up in the rod will break the glass.

A stopper closes the other end of the tube. When the rod is properly stroked and set into vibration, standing waves are set up in the vibrating rod. When the rod is vibrating in this manner it is vibrating with its fundamental frequency and the wavelength of the standing wave is twice the length of the rod.

The vibrations of the rod are transmitted by the disk to the air in the glass tube closed at one end. The waves set up in the air in the glass tube have the same frequency as those in the rod. The waves are reflected at the closed end of the tube and the air in the tube is thus acted upon by two similar sets of waves travelling in opposite directions. When the length of the air column is some multiple of half wavelengths, the two oppositely travelling waves produce standing waves.

The standing waves are characterized by alternate points of maximum and minimum disturbance called respectively nodes and antinodes. These nodes and antinodes may be detected by cork dust placed in the tube, the cork dust showing characteristic striated vibration patterns at the antinodes. The distance between two successive patterns is therefore one-half the wave length of the sound in the air.

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KUNDT TUBE VIBRATION OF A ROD PDF

Tygozuru The length of the metal rod is equal to half the wavelength of the sound wave in the material of the rod. For all warranty replacement, a written statement with an authorized signature indicating the reason for rejection attaching test reports are requested to accompany the returned parts. Please mail us to mail holmarc. The wave length of the sound in air is thus determined.

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Kundt's tube

When the rod is vibrating in this manner it is vibrating with its fundamental frequency and the wavelength of the standing wave is twice the length of the rod. The result should be that the note is an octive higher. On altering the position of bibration piston, a point is reached where an overtone of the air column coincides with the fundamental of the rod, and thus produces resonance within the tube. A clamp at one end of the base holds a metal rod which has a metal disk attached to one end. In a solid such as a metal rod, sound can be transmitted either by longitudinal or transverse waves.

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