3 A Group of Waves Consider the composition of three waves, yo, Y1, and y2 given by yo = A sin (kr – wt) (-4)-- (--)] A Y1 = sin A sin k + a) Express the superposition y, + y1 + Y2 as a single product of trigonometric functions. Sketch the resultant wave for t = 0. b) If Ak/k = 10-2, how many zeros does the waveform have within each region of reinforcement (between adjacent zeros of the envelope)? c) If the phase velocity w/k = 10 cm/sec, Ak/k = 10~2, and Aw/w = 10-3, then what is the group velocity of the waveform? %3D

Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A Group of Waves
3
Consider the composition of three waves, yo, Y1, and y2 given by
y0 = A sin (ka - wt)
(-4) -- (--) ]
A
sin
Ak
2
A
Y2 =
Ak
Aw
sin (k
a) Express the superposition yo + yı + y2 as a single product of trigonometric functions. Sketch
the resultant wave for t = 0.
b) If Ak/k = 10-?, how many zeros does the waveform have within each region of reinforcement
(between adjacent zeros of the envelope)?
c) If the phase velocity w/k = 10 cm/sec, Ak/k = 10-2, and Aw/w = 10-3, then what is the
group velocity of the waveform?
Transcribed Image Text:A Group of Waves 3 Consider the composition of three waves, yo, Y1, and y2 given by y0 = A sin (ka - wt) (-4) -- (--) ] A sin Ak 2 A Y2 = Ak Aw sin (k a) Express the superposition yo + yı + y2 as a single product of trigonometric functions. Sketch the resultant wave for t = 0. b) If Ak/k = 10-?, how many zeros does the waveform have within each region of reinforcement (between adjacent zeros of the envelope)? c) If the phase velocity w/k = 10 cm/sec, Ak/k = 10-2, and Aw/w = 10-3, then what is the group velocity of the waveform?
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