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 120 off
USE CODE: MOB20

				   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

The cieling of long hall is 25 m high What is the maximum horizontal distance that a ball thrown with a speed of 40 ms can go without hitting the ceiling of wall? Plz explain with a DIAGRAM
 
 
Let the angle of throwing be Q with respect to the ground So, the range is R = 40*cosQ*t where t = time taken reach ground. Now, we know the time taken to reach the top of its flight is...
 
Tapas Khanda one month ago
 
Let the angle of throwing be Q with respect to the ground So, the range is R = 30*cosQ*t where t = time taken reach ground. Now, we know the time taken to reach the top of its flight is...
 
Tapas Khanda one month ago
 
Diagram is not required to solve this question. You can directly use the formula to find range : R = (v^2/g)*sin2Q Maximum height reached, H = v^2*sin^2Q/2g So, 25 = 40^2*sin^2Q/(2*9.8) So, ...
 
Tapas Khanda one month ago
what is work energy thereom...................................?
 
 
Relation bewteen KE and W: The work done on an object by a net force equals the change in kinetic energy of the object: W = KEf - KEi. This relationship is called the work-energy theorem.
 
Shreyas Patil one month ago
 
dear tushan, The work done by the resultant force acting on a body is equal to the change in its kinetic energy.
 
SAI SARDAR one month ago
 
dear tushan, The work done by the resultant force acting on a body is equal to the change in its kinetic energy.
 
tushan one month ago
 
For any net force acting on a particle moving along any curvilinear path, it can be demonstrated that its work equals the change in the kinetic energy of the particle by a simple derivation...
 
3 days ago
 
To change the kinetic energy of a particle we have to apply a force on it and the force must do work on it. This relationship between KE and WORK is called "work -energy theorem...
 
3 days ago
 
work done by all forces =change in K.E it can also written as,[W=KEf-KEi] .That means kinetic energy lost is converted inti work &vice a versa.,
 
21 hours ago
sir,what is omh’s law ?explain me clearly.
 
 
The current flowing through a conductor is directly proportional to the potential difference applied across its ends,keeping the temperature and other physical conditions remain unchanged.
 
2017 years ago
if a,b,c are three unit vectors such that a + b + c = 0 , then find the value of a.b + b.c + a.c ??
 
 
a + b + c=0 Therefore ,(a+b+c)^2 =0Therefore (mod of a)^2 +(mod of b)^2 + (mod of c)^2 +2 (a.b + b.c + c.a) =0As a, b, c are unit vectors , square of their mod will be equal to oneHence 1 +...
 
2017 years ago
what is the diffrence between centroid and center of gravity
 
 
Centroid is the geometrical centre of the body..Centre of gravity is the point on which the gravity acts...(For uniform body centre of gravity=centre of mass)So,we can calculate the centroid...
 
2017 years ago
 
Centroid is the centre of mass of a geometric object of uniform density. Center of gravity is a point from which the weight of a body or system may be considered to act. In uniform gravity...
 
yesterday
Is there any book on theory of relative velocity of approach and separation
 
 
@ manju h c ver ma is the best one for that , it explains the relative velocity part in a little bit of detail by taking the example of diffrent scenario . so, u can use that , they also...
 
Umakant biswal 2 months ago
 
I think cengage physics mechanics-1 is the best because there is a complete explaination about all cases like minimum time of approach also angle of particles without using calculus and in...
 
benny bhai 2 months ago
 
DC Pandey explains the topic clearly andcan be very helpful to do problems related to relative velocity.So I would recommend you Mechanics-I by DC Pandey.
 
Mudit 2 months ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 4,500 off
USE CODE: Venkat30

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

Get extra R 120 off
USE CODE: MOB20

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