Consider the following statements : I. In a seismograph, P waves are recorded earlier than S waves. II. In P waves, the individual particles vibrate to and fro in the direction of wave propagation whereas in S waves, the particles vibrate up and down at right angles to the direction of wave propagation. Which of the statements given above is/are correct?
- A. I only
- B. II only
- C. Both I and II ✓
- D. Neither I nor II
Correct Answer: C. Both I and II
Explanation
P (Primary) waves travel faster than S (Secondary) waves, so they arrive and are recorded first. P waves are longitudinal (particles vibrate in the direction of propagation), while S waves are transverse (vibrate perpendicular to the direction of propagation).
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