Are concerned with determining the thickness d of a layer of soil that lies on top of
Question:
Are concerned with determining the thickness d of a layer of soil that lies on top of a rock formation. Geologists send two sound pulses from point A to point D separated by a distance s. The first pulse travels directly from A to D along the surface of the earth. The second pulse travels down to the rock formation, then along its surface, and then back up to D (path ABCD), as in Figure 41. The pulse travels with velocity v1 in the soil and v2 in the rock.
Continue with the assumption of the previous exercise.
(a) Find the thickness of the soil layer, assuming that v1 = 0.7v2, t2/t1 = 1.3, and s = 400 m.
(b) The times t1 and t2 are measured experimentally. The equation in Exercise 79(c) shows that t2/t1 is a linear function of 1/s.What might you conclude if experiments were formed for several values of s and the points (1/s, t2/t1) did not lie on a straight line?
Data From Exercise 79(c)
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