(i) At what depth does the curve of the secondary waves seem to have ended in figure (A)?

Question

Study the following map/ figure /graph and answer the following questions : 

(i) At what depth does the curve of the secondary waves seem to have ended in figure (A)?

(ii) What is the velocity of the secondary waves around the boundary of the outer core shown in figure (A)?

(iii) What conclusion can be drawn on the basis of the curve of the secondary waves stopping around the depth of 2900 km?

(iv) What is the velocity of the primary waves at the time of entering the outer core shown in figure (A)?

(v) What conclusions can be drawn about the intensity of the gravitational force shown in Figure (B)?

Answer 1

(i) The curve of the secondary waves seems to have ended around the depth of 2900 km in figure (A).

(ii) The velocity of the secondary waves is 6 to 8 km/sec around the boundary of the outer core shown in figure (A).

(iii) On the basis of the curve of the secondary waves stopping around the depth of2900 km, it can be concluded that secondary waves do not enter the core.

(iv) The velocity of the primary waves at the time of entering the outer core shown in figure (A) is 8 km/sec.

(v) The following conclusions can be drawn about the intensity of the gravitational force shown in Figure (B) :

1. Gravitational force increases at certain depth from the surface of the earth and then it reduces according to the depth. 

2. At the centre of the earth, the gravitational force is zero.