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

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

(a) α = 10 log(A0/A)/X

(b) α = 20 log(A0/A)*X

(c) α = 10 log(A0/A)*X

(d) α = 20 log(A0/A)/X

This question was addressed to me in exam.

This intriguing question originated from Inspection Procedures in division Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct answer is (d) α = 20 log(A0/A)/X

To explain I would say: Ultrasonic attenuation coefficient (α) is calculated from the following equation-

α = 20 log(A0/A)/X

Where, A0 and A are the ultrasound amplitudes before and after travelling through the material, and X is the travel distance. The measurement of attenuation coefficient is mainly used to find qualitative and quantitative information on the internal structure of products or castings.

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