[Solved] Which of the following describes the sound field propagating in a piece of steel bar stock which is being tested from one end with longitudinal waves?

Q.	Which of the following describes the sound field propagating in a piece of steel bar stock which is being tested from one end with longitudinal waves?
A.	Non uniform, containing maxima and minima because of the focusing effect of laterally reflected waves
B.	Increasing to a peak, then decreasing throughout the far field
C.	Uniformly decreasing along the length of the bar
D.	Decreasing according to the inverse square law
Answer» D. Decreasing according to the inverse square law

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