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 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?
✓ Correct answer: c) Both 1 and 2
ExplanationStatement 1 is correct : There are two types of body waves- P and S waves.The P-waves and S-waves are also known as primary waves and secondary waves, respectively.The P-waves move faster and are the first to arrive at the surface.Therefore, in a seismograph, P waves are recorded earlier than S waves.The S-waves arrive at the surface with some time lag.Statement 2 is correct : In P-waves, the media particle vibrates parallel to the direction of the wave.Thus it causes the to-and-fro motion.Further, in the S-waves media particles vibrate perpen- dicular (up and down at right angles) to the direction of wave propagation i.e. in the right angle.P-waves S-waves Arrival Times Surface Waves Amplitude 96
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