5.18 Consider an anelastic medium cycled at frequency \omega.
Show that there is a phase difference between stress and strain, amounting to 1/(Q \omega) seconds. [You may assume Q >> 1, and the discussions in Box 5.5 and following equation (5.82).]
Does the stress lead the strain, or the strain lead the stress?
On a plot of strain against stress, there will be a hysteresis loop. Evaluate its area, and show that this is consistent with the first definition of
Q given in Box 5.7 [whoops: in the April 2009 paperback it said Box 5.5 here, which is wrong…].

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