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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

Earthquakes at fault lines in Earth’s crust create seismic waves, which are longitudinal (P-waves) or transverse (S-waves). The P-waves have a speed of about 7 km/s. Estimate the average bulk modulus of Earth’s crust given that the density of rock is about 2 500 kg/m3.

To determine
The average bulk modulus of earth’s crust.

Explanation

Given info: The speed of longitudinal wave is 7×103m/s and density of rock is 2500kg/m3 .

Formula for speed of longitudinal waves in a fluid is,

          v=βρ

  • β  is the bulk modulus of earth’s crust,
  • ρ is the density of the rock,

On rearranging,

β=v2ρ

Substitute 7×103m/s

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