why the cracks inside does not allow ultrasound to pass
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they are faults and ultrasounds travel in a straight line they cant bend and take another route so they cannot pass through cracks or faults
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Let's answer this in a way you might properly understand.
Imagine you have a strong rubber band in your hand, but in some lengths of the band the material is made of a more weaker variant of the band.
Start stretching and relaxing the band in a very rough/ferocious manner. You might notice that while the stiffer parts of the band would relax and stretch the way you'd want, the more weaker parts are just too loose to even do either. They are points where the elastic energy of your stretching and relaxing aren't done properly.
Same is here with the ultrasound. They don't propagate the energy more properly because the crack usually doesn't have the same elastic strength as that of the material surrounding it.
The other answer points to the fact that there is a void in the material. While at times this might be true, the real working is the one stated above.
Imagine you have a strong rubber band in your hand, but in some lengths of the band the material is made of a more weaker variant of the band.
Start stretching and relaxing the band in a very rough/ferocious manner. You might notice that while the stiffer parts of the band would relax and stretch the way you'd want, the more weaker parts are just too loose to even do either. They are points where the elastic energy of your stretching and relaxing aren't done properly.
Same is here with the ultrasound. They don't propagate the energy more properly because the crack usually doesn't have the same elastic strength as that of the material surrounding it.
The other answer points to the fact that there is a void in the material. While at times this might be true, the real working is the one stated above.
daksh050:
Your answer is not satisfactory
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