30 = L/v(s) - L/v(p) =
=2L/v(p) - L/v(p) = L/v(p),
L=30 v(p) = 30•6000=180000 m=180 km
Earthquakes are motions of the earth's crust. Essentially, they are big sound waves that travel through the earth. There are two types of waves. The first type is called a longitudinal or P wave, where the earth compresses in the same direction as the wave travels. The second type is called a transverse, or S wave, where the compression in the earth is perpendicular to the direction of the wave. P waves travel roughly twice as fast as S waves.
A seismograph is a device for measuring these waves. By measuring the time between the arrival of each wave, we can calculate the distance to an earthquake. A seismograph measures a P wave and then an S wave 30 seconds later. If the P waves travel at 6000 m/s, how far away was the earthquake in kilometers?
2 answers
myname is shrish please answer my physic quet please its urgent