Experiments

a) Master resonance interference method, phase-comparison method and time-difference method to measure the velocity of sound in different medium.

b) Master using acoustic levitation phenomenon to measure the velocity of sound.

Features

a) Use ultrasonic to suspend the object in the air medium.

b) Observing the resonance and sine distribution in the air medium can be a demonstrative experiment for acoustic levitation. And also it can be used for measuring ultrasonic wavelength by acoustic levitation and the experimental context by repeating traditional measuring the velocity of sound experiment.

Specifications

Experiments and data

a) Measuring the velocity of sound wave in the air by stationary wave method

(Need dedicated signal source and dual trace oscilloscope)

λ_averag=9.156mm, V_e = f x λ = 37.855 x 10³ x 9.156 x 10^-3 = 346.60m/s

E_relative=｜V_e-V_t｜/V_t x 100% = ｜346.60-343.37｜/343.37 x 100% = 0.94%

b) Measuring the velocity of sound wave in the air by phase method)

(Need dedicated signal source and dual trace oscilloscope)

λ_averag=9.154mm, V_e = f x λ = 37.910 x 10³ x 9.154 x 10^-3 = 347.03m/s

E_relative=｜V_e-V_t｜/V_t x 100% = ｜347.03 - 344.54｜/344.54 x 100% = 0.72%