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 v 1 in the soil and v 2 in the rock Continue with the assumption of the previous exercise (a) Find the thickness of the soil layer, assuming that v 1 0 7v 2 , t 2 t 1 1 3, and s 400 m (b) The times t 1 and t 2 are measured experimentally The equation in Exercise 79(c) shows that t 2 t 1 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, t 2 t 1 ) did not lie on a straight line Data From Exercise 79(c) A B S Soil Rock FIGURE 41 C D 0 d

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

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 v₂in the rock.

A B S Soil Rock FIGURE 41 C D 0 d

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 t₁and t₂are measured experimentally. The equation in Exercise 79(c) shows that t₂/t₁is 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)

A B S Soil Rock FIGURE 41 C D 0 d

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