MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Kinematics & Rotational Motion
  • OFFERED PRICE: R 600
  • View Details
Get extra R 60 off
USE CODE: SS10

				   Please give me a large information about Ultrasonic interferometer (minimum in 3 to 4 paragraphs).
				   

5 years ago

Share

Answers : (1)

										

                                                 Ultrasonic Interferometer


Aim:



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

  • To calculate the adiabatic compressibility of the given liquid.


Apparatus:


Ultrasonic interferometer, sample liquids, high frequency generator etc.


Theory:


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.


Ultrasonics:


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.

5 years ago

Post Your Answer

Other Related Questions on General Physics

11 th class
 
 
Any Question.
  img
Vijay Mukati one year ago
 
yaa ask any question in maths. i can try it .
 
srinivas one year ago
Hi my son is studying in 9 th standard and attending foundation course for IIT. can you pls inform the problem solving technique for Physics and is there any book is available for 9 th std...
 
 
For the 9 th class students, only the text book avaliable with him and the material provided by the institute is sufficient. He should try to solve them compelete. that is sufficient for...
  img
Vijay Mukati one year ago
 
you can buy iit foundation by pearson
 
samagra one year ago
what is physics?
 
 
the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity,...
 
charan 10 months ago
 
the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity,...
 
k santhosh 10 months ago
 
the branch of science concerned with the nature and properties of matter and energy.
 
Jinkasreenivasulu 10 months ago
what is magnetic dipole
 
 
Simply magnetic dipole can be considered as a bar magnet which has two unlike poles (north pole and south pole) and has a certain length. It is just like the electric dipole which consists...
 
Adarsh one year ago
 
IT IS SAME AS THE DEFINITION OF TH ELECTIC DIPOLE BUT THE TERMS GET CHANGE. DEF; WHEN A EXTERNAL FORCE APPLIED ON THE CHARGED ROD OF LENGTH 2a IN THE MAGNETIC FIELD THE EX TERNAL FORCE IS...
 
Dhulipala Srikanth one year ago
 
Magnetic dipole , generally a tiny magnet of microscopic to subatomic dimensions, equivalent to a flow of electric charge around a loop. Electrons circulating around atomic nuclei,...
 
shubham sharda one year ago
What is ordinary ray?
 
 
The light ray which follows Snell`s law is called ordinary ray. For this ray refractive index µ and velocity of light is same through out that medium. Secondary wavefront of ordinary ray is...
 
PRAPULPODISHETTI 10 months ago
 
For any ray direction there will be a polarization direction perpendicular to the optic axis, and this is called an ordinary ray .
 
KUNCHAM SAMPATH 10 months ago
 
The light ray which follows Snell`s law is called ordinary ray. For this ray refractive index µ and velocity of light is same through out that medium. Secondary wavefront of ordinary ray is ...
 
SHANMUKESHWAR 10 months ago
In the binary system the number 100 represents: one three four hundred
 
 
100 = 2^2 *1 + 0* 2 + 0 * 2^0
  img
Nishant Vora one year ago
 
four. Please Hit approve if answer is correct.
 
shubham sharda one year ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 1,500 off
USE CODE: SS10

  • Kinematics & Rotational Motion
  • OFFERED PRICE: R 600
  • View Details

Get extra R 60 off
USE CODE: SS10

More Questions On General Physics

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details