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Question

Q. Consider the following statements:
  1. Primary waves (P-waves) totally disappear in the  region of the core, revealing that the outer core is made up of liquid.
  2. Secondary waves (S-waves) show a change in its speed as it travels from the magma chamber to the lithosphere region, indicating the difference in density.
Which of the statements given above is/are correct?

  1. 1 only

  2. 2 only

  3. Both 1 and 2

  4. Neither 1 nor 2


Solution

The correct option is B
2 only
Explanation:

Statement 1 is incorrect: P-waves are compression waves that are longitudinal in nature. These waves can travel through any type of material, including fluids.

Statement 2 is correct: S-waves are shear waves that are transverse in nature. S-waves can only travel through solids, as fluids (liquids and gases) do not support shear stresses. So S-waves do disappear in the core region as the outer core is liquid in nature. Since, there is a density difference between lithosphere and magma chamber, the speed of the S waves do change.

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