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Wave in Negative X-Direction

Two super imp...

Question

Two super imposing wave have equation y1=2sin2π(10t-0.4x) and
Y2=4sin2π (20t-0.8x). What is ratio of iMax:I min.

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Solution

Two waves superimpose when their frequencies are equal so taking 2 common from equation 2 we get
Y2=8sin2π (10t-0.4x).
now a1=2
a2=8
imax=(a1+a2)^2=(8+2)^2=100
i min=(a1-a2)^2=(2-8)^2=36
i max/i min=100/36=25:9

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