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Seismic Waves
Consider the following statements with reference to ‘Seismic Waves’:
- P-waves are the first waves detected by seismographs (instruments used to detect and record earthquakes).
- P-waves can travel through solids and liquids (since they are longitudinal waves) whereas S-waves can only travel through solids (as they are transverse waves).
Choose the correct answer from the options given below:
A |
Only 1
|
|
B |
Both 1 and 2
|
|
C |
Only 2
|
|
D |
Neither 1 nor 2
|
Your Ans is
Right ans is B
Your Answer Is Correct
Your Answer Is Wrong
Explanation :
P-waves
- These are the first waves detected by seismographs (instruments used to detect and record earthquakes).
- These are longitudinal waves which means they vibrate along the same direction as they travel.
- Examples of longitudinal waves include sound waves and waves in a stretched spring.
S-waves
- These waves arrive at the detector after primary waves.
- These are transverse waves which means they vibrate at a right angle to the direction in which they travel.
- Examples of transverse waves include light waves and water waves.
Difference
- Both types of seismic waves can be detected near the earthquake centre but only P-waves can be detected on the other side of the Earth.
- P-waves can travel through solids and liquids (since they are longitudinal waves) whereas S-waves can only travel through solids (as they are transverse waves).
- This means the liquid part of the core blocks the passage of S-waves.
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