1.

Which of the following formulas is used for the calculation of ultrasonic attenuation coefficient ( )?

A. = 10 log(A<sub>0</sub>/A)/X
B. = 20 log(A<sub>0</sub>/A)*X
C. = 10 log(A<sub>0</sub>/A)*X
D. = 20 log(A<sub>0</sub>/A)/X
Answer» E.


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