Consider the following statement with respect to Earthquake waves:
1. Primary waves move faster than Secondary waves and are the first to arrive at the surface.
2. Primary waves can travel through solid state only.
3. The shadow zone of Primary waves is smaller than Secondary waves.
How many of the above statements is/are correct?
(a) Only one
(b) Only two
(c) All three
(d) None
Explanation Statement 1 is correct: Earthquake waves are basically of two types: Body waves and Surface waves. Body waves are generated due to the release of energy at the focus and move in all directions travelling through the body of the earth. Hence. The name body wave. The Body wave interacts with the surface rocks and generates a new set of waves called Surface waves. Body waves are of two types: Primary waves and Secondary Waves.
Primary waves move faster and are the first to arrive at the surface.
Statement 2 is not correct: Primary wave can travel through all 3 states whereas the Secondary wave can travel through solid state only.
Statement 3 is correct: The shadow zone of the Secondary wave is larger than the Primary wave because.The Shadow zone of the Secondary wave is not only larger in extent but it is also a little over 40% of the earth surface.
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