At a recording station, a difference in time of arrival between p waves and s waves was observed to be 1.5 seconds. What is the approximate distance from the station at which the event occurred? Assume p wave velocity as 7.97 km/s and s wave velocity as 4.55 km/s
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At a recording station, a difference in time of arrival between p waves and s waves was observed to be 1.5 seconds. What is the approximate distance from the station at which the event occurred? Assume p wave velocity as 7.97 km/s and s wave velocity as 4.55 km/s.
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- 1. (a) What is the intensity in W/m² of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 650 J of energy into a circular spot 1.9 mm in diameter in 4 s? Hint: The laser is a collimated beam of light and does not produce a spherical wave. W/m² (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m²) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure. The intensity of a laser is about be very damaging if they enter your eye. ✓times that of the sun, so clearly lasers canSuppose that there is a seismic P wave traveling at 5.1x103 m/s with a wavelength of 1.9 103 m. (a) Find the wave's frequency.(b) Find the average speed of a particle of the earth's surface at a point where the wave amplitude is 2.7 cm.Write the y-equation for a wave traveling in the negative x-direction with wavelength 50 cm, speed 4.0 m/s, and amplitude 5.0 cm.