FIGURE Q16.9 shows the wavefronts of a circular wave. What is the phase difference between
(a) points A and B,
(b) points C and D, and
(c) points E and F?
a) The phase difference between A and B is zero.
b) The phase difference between points C and D is 4π radians
c) The phase difference between points E and F is π radians
The wavefronts of a circular wave with different points are given in the diagram
It is the locus of all the points which are having the same phase
The phase difference between adjacent wavefronts is 2π radians
Earthquakes are essentially sound waves—called seismic
waves—traveling through the earth. Because the earth is solid, it can support both longitudinal and transverse seismic waves. The speed of longitudinal waves, called P waves, is 8000 m/s. Transverse waves, called S waves, travel at a slower 4500 m/s. A seismograph records the two waves from a distant earthquake. If the S wave arrives 2.0 min after the P wave, how far away was the earthquake? You can assume that the waves travel in straight lines, although actual seismic waves follow more complex routes.
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