Exercises 6.4: Noise

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A . . . . B .

6.4.1 The figures show the instantaneous average velocity of the electrons WITH RESPECT TO their time average velocity. (I.e., the drift velocity has been subtracted off the data.) The blue and green traces are respectively the x- and y-components of the velocities. One run is at low temperature and with an electric field. The other is with no field but a higher temperature. Which is which?