Chapter 26, Problem 2RAT

To determine

The correct option for the statement “Seismic waves increase in speed when".

Answer to Problem 2RAT

The correct option for the statement “Seismic waves increase in speed when" is option (b).

Explanation of Solution

The speed of seismic waves decreases when they pass through a liquid. The seismic waves cause horizontal shaking while traveling through the surface. When these waves travel through the liquid, there is no shear strength of the liquid. This is the reason that the seismic waves unable propagate within the liquid.

The speed of the seismic waves depends upon the density of the solid material. Its speed decreases when they pass through higher density material. So the speed of the seismic wave will increase when they pass through less dense and rigid rocks.

Conclusion:

Therefore, the correct option for the statement “Seismic waves increase in speed when" is option (b).