[B] Earthquakes generate two sorts of waves in rock, shear or 5 waves which travel at about 4.5km/s and pressure or P waves traveling at about 8 km/s.(1) After one such quake, a seismograph station picks up the S wave 3.0 minutes after the P wave.How far away was the source, or epicenter, of the earthquake? |(2) When a quake is detected, a steady 250 Hz alarm sounds in the hallway of a facility to alert theperson on watch. The alarm is also sent to the cell phones of the staff on duty which emit the same250 Hz tone. One of the staff responding to the alert runs down the hall, approaching the hallwayspeaker. She notices a 2 Hz variation in the loudness of the 250 Hz tone as she runs with her phone.What frequency is she hearing from the speaker? From your answer, how fast was she running, if thespeed of sound is 344 m/s?A wave traveling through granite comes to a boundary with sandstone. The effective bulkmodulus and density for each of these rocks is given in the table below. If you look uphow to do this, I have already adjusted the bulk modulus using the shear modulus.Bulk modulus:DensityGPakg/m3Granite922660Sandstone1523233) Calculate the wave speed for P waves in granite and in sandstone.4) If the wave in the granite hits the boundary with the sandstone at an angle of 90°(head-on, no angle to worry about), describe the reflected and transmitted waveamplitudes (relative size, flipped or not). (No math here.)5) Derive the transmission and reflection coefficients (the ratios of the reflected andtransmitted amplitudes to the incident amplitude) and calculate their values. Omit anypossible phase shifts here. It is simplest to set the boundary as x = 0 and use cosinefunctions for each of the 3 waves.

Hai, since there are multiple questions posted, we will answer the first question. The equation for…

[B] Earthquakes generate two sorts of waves in rock, shear or S waves which travel at about 4.5 km/s and pressure or P waves traveling at about 8 km/s. (1) After one such quake, a seismograph station picks up the S wave 3.0 minutes after the P wave. How far away was the source, or epicenter, of the earthquake? |

[B] Earthquakes generate two sorts of waves in rock, shear or S waves which travel at about 4.5 km/s and pressure or P waves traveling at about 8 km/s. (1) After one such quake, a seismograph station picks up the S wave 3.0 minutes after the P wave. How far away was the source, or epicenter, of the earthquake? |

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.

Question

[B] Earthquakes generate two sorts of waves in rock, shear or 5 waves which travel at about 4.5
km/s and pressure or P waves traveling at about 8 km/s.
(1) After one such quake, a seismograph station picks up the S wave 3.0 minutes after the P wave.
How far away was the source, or epicenter, of the earthquake? |
(2) When a quake is detected, a steady 250 Hz alarm sounds in the hallway of a facility to alert the
person on watch. The alarm is also sent to the cell phones of the staff on duty which emit the same
250 Hz tone. One of the staff responding to the alert runs down the hall, approaching the hallway
speaker. She notices a 2 Hz variation in the loudness of the 250 Hz tone as she runs with her phone.
What frequency is she hearing from the speaker? From your answer, how fast was she running, if the
speed of sound is 344 m/s?
A wave traveling through granite comes to a boundary with sandstone. The effective bulk
modulus and density for each of these rocks is given in the table below. If you look up
how to do this, I have already adjusted the bulk modulus using the shear modulus.
Bulk modulus:
Density
GPa
kg/m3
Granite
92
2660
Sandstone
15
2323
3) Calculate the wave speed for P waves in granite and in sandstone.
4) If the wave in the granite hits the boundary with the sandstone at an angle of 90°
(head-on, no angle to worry about), describe the reflected and transmitted wave
amplitudes (relative size, flipped or not). (No math here.)
5) Derive the transmission and reflection coefficients (the ratios of the reflected and
transmitted amplitudes to the incident amplitude) and calculate their values. Omit any
possible phase shifts here. It is simplest to set the boundary as x = 0 and use cosine
functions for each of the 3 waves.

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