Lecture 22, ACT 2

• Snapshots of a wave with angular frequency w are shown at 3 times:

  • Which of the following expressions describes this wave?

(a) y = sin(kx-wt)

(b) y = sin(kx+wt)

(c) y = cos(kx+wt)

• The t=0 snapshot Þ at t=0, y = sinkx

• At t=p/2w and x=0, (a) Þ y = sin(-p/2) = -1

• At t=p/2w and x=0, (b) Þ y = sin(+p/2) = +1

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