Acoustic grating & Stress and Strain

Acoustic greeting:

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 When ultrasonic waves travel from one end into the liquid medium and are reflected

Nodes in this medium from the other end and 

Anti-nodes. The density of the liquid will be at most nodes and at least low. 

Anti-nodes. The node will behave like an opaque region and the anti-nodes will behave 

Like the transparent region. Now the liquid behaves as a diffraction grating and it is 

Which is called sound greeting.

 Sin (Theta) = N*(Lamda) --------(EQ.1)

where D is the distance between any two successive nodes or the antinodes of the resident

wave

 Lambda is the wavelength of the monochromaticity.

If 'F' is the frequency of ultrasonic waves, then the speed of ultrasonic 

Waves are given in liquid

 Ultrasonic speed =frequency*wavelength

 b = f*lambda(u) ----------(eq.4)

Subtract the value of lambda(u) in (eq.4)

 Speed =F*N*Lambda/Sin (Theta)

Replacing the values of F, N, Lambda and Theta, the velocity of ultrasonic waves

Can be determined in liquidlike source of light 

 Theta is the angle of distortion

Let Lambda(U) be the wavelength of ultrasonic waves in a liquid medium, then

 D=Lambda(U)/2

 2D=Limda(U) -------(EQ.2)

Then (EQ.1) becomes, 

Lamda (U)*Sin (Theta) = N*(Lamda)

 Lamda(U) = N*Lamda/Sin (Theta) ---------(EQ.3)