Question

An ultrasonic interferometer used to measure the velocity in sea water.
If the distance between two constructive antinodes is 0.55 mm.
Compute the velocity of the wave in the sea water. The frequency of
the crystal is 1.5 MHz.

Answer 1

Answer:

The velocity of ultrasound is determined principally by the compressibility of the material of the medium. For a medium with high compressibility, the velocity will be less. Adiabatic compressibility of a fluid is a measure of the relative volume change of the fluid as a response to a pressure change. Compressibility is the reciprocal of bulk modulus, and is usually denoted by the Greek word beta (β).The adiabatic compressibility of the material of the sample can be calculated using the equation,

,

Where ρ is the density of the material of the medium and v is the velocity of the sound wave through that medium.