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Seismograph

A __________ ...

Question

A records the waves generated by an earthquake, known as waves.

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Solution

A seismograph or seismometer records the waves generated by an earthquake. These waves are known as seismic waves.

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4 k m s^{- 1}

P

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Q. Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse (S) and longitudinal (P) sound waves. Typically the speed of S wave is about 4.0 km s¯¹, and that of P wave is 8.0 km s–1. A seismograph records P and S waves from an earthquake. The first P wave arrives 4 min before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur ?

Q. A seismograph is a graph which records an earthquake.

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