Measurment of sound speed in air

Fizikos laboratorinis darbas. Measurement of speed of sound in air by means of Kundt’s method. Work methodics and main formulas. Work results 1 Table. No. 1 frequency 1200Hz. No. 2 Frequency 1400Hz. Nr. 3 Frequency 1600kHz.

APPARATUS: An acoustic apparatus for measurements of the speed of sound in a gas. It consists of: an air-filled horizontal tube 1 with a loudspeaker 2 and a microphone 3 (as sound detector) mounted in- side the tube. There are also a sin-wave oscillator , an oscilloscope , a ruler , and a thermometer .

v – longitudal sound waves speed in air; T – air temperature; γ –molar specific heat difference; R – universal gas constant; M – air molar mass.

1. Turn on sin-wave oscillator and set its electric signal frequen- cy in the range of 1.5–2.5 kHz. Make sure the microphone detects the sound and the oscilloscope shows a sin-wave vol- tage which amplitude is proportional to intensity of the sound wave emitted by the loudspeaker.

Measurment of sound speed in air. (2015 m. Gegužės 17 d.). Peržiūrėta 2018 m. Vasario 19 d. 22:00