Total Price: R

There are no items in this cart.
Continue Shopping
                   Please give me a large information about Ultrasonic interferometer (minimum in 3 to 4 paragraphs).

3 years ago


Answers : (1)


                                                 Ultrasonic Interferometer


  • To calculate the velocity of ultrasonic sound through different liquid media.

  • To calculate the adiabatic compressibility of the given liquid.


Ultrasonic interferometer, sample liquids, high frequency generator etc.


Ultrasonic interferometer is a simple device which yields accurate and consistent data, from which one can determine the velocity of ultrasonic sound in a liquid medium.


Ultrasonic sound refers to sound pressure with a frequency greater than the human audible range (20Hz to 20 KHz). When an ultrasonic wave propagates through a medium, the molecules in that medium vibrate over very short distance in a direction parallel to the longitudinal wave. During this vibration, momentum is transferred among molecules. This causes the wave to pass through the medium.




Generation of ultrasound:

Ultrasonic can be produced by different methods. The most common methods include:

  1.  Mechanical  method:       In this, ultrasonic frequencies up to 100 KHz are produced. But this method is rarely used due to its limited frequency range.

  2. Piezoelectric generator:    This is the most common method used for the production of ultrasound. When mechanical pressure is applied to opposite faces of certain crystals which are cut suitably, it get contracted and expanded. i.e., a rapid alternating electric field causes the piezoelectric crystal to vibrate. This vibration is largest at resonance, and is then passed through the medium as a longitudinal wave. i.e., a sound wave is produced.

  3. Magnetostriction generator:   In this method, the magnetostriction method is used for the production of ultrasonic. Frequencies ranging from 8000 Hz to 20,000Hz can be produced by this method.

Ultrasonic Interferometer:

The schematic diagram of an ultrasonic interferometer is shown below.


In an ultrasonic interferometer, the ultrasonic waves are produced by piezoelectric method. In a fixed frequency variable path interferometer, the wavelength of the sound used is measured, and from this one can calculate its velocity through that medium. The apparatus consists of an ultrasonic cell, which is a double walled brass cell with chromium plated surfaces and has a capacity of 10ml. The schematic diagram of an ultrasonic interferometer is shown below. The micrometer screw has a least count of 0.001cm and pitch scale has a length of 25mm. Ultrasonic waves of known frequency are produced by a quartz crystal which is fixed at the bottom of the cell. There is a movable metallic plate parallel to the quartz plate, which reflects the waves. These waves superimpose and if the separation between the plates is exactly a whole number multiple of wavelength of sound, standing waves are produced in the liquid medium. At this point, acoustic resonance occurs and this give rise to an electrical reaction on the generator driving quartz plate. Now the anode current of the generator becomes maximum.

If we increase or decrease the distance and the variation is exactly one half of the wavelength (λ/2) or its multiple, the anode current again becomes maximum. If ‘d’is the   separation between successive adjacent maximum anode current, then,

d = λ/2.

v:unknown * { BEHAVIOR: url(#default#VML) } o:unknown * { BEHAVIOR: url(#default#VML) } w:unknown * { BEHAVIOR: url(#default#VML) } .shape { BEHAVIOR: url(#default#VML) }

We have, the velocity (v) of a wave is related to its wavelength (λ) by the relation,

                                   v=fλ, where f is the frequency of the wave.

                                   Then,   v= λf= 2df.

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.

3 years ago

Post Your Answer

More Questions On General Physics

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details
question is in the image
Use the resultant vector formula, R 2 = P 2 + Q 2 + 2PQ COS@ Put the angles in tqo different cases and calculate the ratio...................
Saurabh Kumar 4 months ago
please sir could you provide the brief solution to this problem
Aman Gandhi 4 months ago
why at uniform gravitational field PE = -GMm/r^2 becomes PE=mgh.... I have confusion where to use which formula,,,can u pls clarify that?
First formula is associated with gravitational potential energy between two objects. While second formula is associated with gravitational potential energy agains earyh’s gravitational...
Saurabh Kumar 2 months ago
than q for ur response sir.. but my ndoubt not cleared... why cant I take earth as one object to apply PE = mgh can u pls derive mgh from -GMm/R
buddha 2 months ago
question is in the image
PLease find the attached file.
Aziz Alam 4 months ago
PLease find the attached file.
Aziz Alam 4 months ago
Three identical metallic plates A,B and C are initially given charges Q,4Q,2Q respectively. If the plates A and C are connected by a conducting wire and plate B is earthed ,then how much...
A and C are connected, so charges on each will become (Q+2Q)/2= 1.5Q B will be eartherd so -4Q charge will flow from earth to B and B will become chargeless Thanx
Rahbar Ahmad 3 months ago
-4Q charge will flow from earth to sphere B thanx
Rahbar Ahmad 3 months ago
How to find the no. of electrons moves around the nucleus in a circular orbit of a radius 5x10 raise to the power minus eleven metre. Is there any way?
yes there is a way but only for those atoms ,, which satisfy the Bhor’s postulates criteria ,, that is , example Hydrogen, Lithum 3+ ,, i.e containing one proton . if i assume this in your...
abhishek singh 28 days ago
see value of Z in the above used formula can vary and it must be a perfect square , i.e 1, 4 , , but the bhor postulate doesn’t go upto Z = 9 , or above , therfre n = 1 or n = 2
abhishek singh 28 days ago
what is Nicol prism
in a polarimeter it is a device which is used to produce the plane polarised light which is used in optical isomerism It is made in such a way that it eliminates one of the rays by Total...
rahul 8 days ago
a device for producing plane-polarized light, consisting of two pieces of optically clear calcite or Iceland spar cemented together with Canada balsam in the shape of a prism.
diva 9 days ago
View all Questions »