Consider the following statements:
1. In a seismograph, P waves are recorded earlier than S waves.
2. In P waves, the individual particles vibrate to and fro in the direction of waves propogation 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?
Answer:
(c)
The answer is (c). Both statements are correct. P waves are compressional waves, which means that the individual particles vibrate to and fro in the direction of wave propagation. S waves are shear waves, which means that the particles vibrate up and down at right angles to the direction of wave propagation. P waves travel faster than S waves, so they are recorded earlier on a seismograph.