Velocity of sound using Kundt's tube with Cobra3

Principle

A metal rod is made to vibrate longitudinally by rubbing it with a cloth. The gas column in a glass tube is caused to vibrate naturally as a result of resonance, through the radiation of sound from a disc attached to the end of the rod. The ratio of the velocities of sound in the gas and in the vibration generator is determined by measuring the wavelength.

Tasks

1. To measure the wavelength of stationary waves using a steel or a brass rod as the vibration generator. The longitudinal velocity of sound in the material of the vibration generator is determined, given the velocity of sound in air.
2. To measure the wavelength for CO2, and to determine the sound velocity in CO2 from the ratios of the wavelengths in air determined in 1. above.

What you can learn about

• Longitudinal waves
• Sound velocity in gases and solids
• Frequency
• Wavelength
• Stationary waves
• Natural vibrations

Literature for this article als follows

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