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When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 8.03 km/s and the secondary, or S, wave has a speed of about 5.63 km/s. A seismograph, located some distance away, records the arrival of the P wave and then, 77.9 s later, records the arrival of the S wave. Assuming that the waves travel in a straight line, how far is the seismograph from the earthquake?
You know that the distance is calculated by:Quote:
Originally Posted by lovinhockey26
Both waves travel the same distance
and
. Use the fact that
:
. After a few steps you'll get:
And now you can calculate the distance to the earthquake.
Hello, lovinhockey26!
Quote:
When an earthquake occurs, two types of sound waves are generated
and travel through the earth.
The primary orwave has a speed of about 8.03 km/s
and the secondary orwave has a speed of about 5.63 km/s.
A seismograph, located some distance away, records the arrival of the
and then, 77.9 s later, records the arrival of the
Assuming that the waves travel in a straight line,
how far is the seismograph from the earthquake?
The
. . Its distance is: .feet.
Theseconds at 5.03 km/sec.
. . Its distance is: .feet.
These distances are equal: .
Go fot it!