Let me address, after a long time, again the experts in the truly bizarre domain which goes by the name "physics":
In my course, my professor says:
With the attenuation of ultrasonic sound waves in a tissue, expressed in , the intensity of the ultrasonic sound wave upon entrance of the tissue (or rather, right before it) and the remainder intensity after passage through the tissue of width .
How is this even legal in physics? He basically states that is dimensionless. Which clearly isn't the case.
Then, he states that alpha is about 20 dB/cm in bone tissue. I can understand that per cm progression of the sound waves in bone, their volume decrease with 20 dB.
Which insinuates the invariability of the intension as the sound wave penetrates the tissue.
Ergo, I don't find it possible for me to solve the question by what factor the original intensity is divided when the sound wave travels 2 cm in bone.
Intuition says: 10,000. But if the formula is correct, and the attenuation is indeed completely independent of the depth, it should be, and remain forever, 100. Please don't tell me that's true.
Edited by Function, 26 January 2017 - 06:20 PM.