Arthur L. Pike, Tufts University, Department of Electrical

Engineering, Medford, Massachusetts

This program sketches graphs of the following wave expressions:

i(y,t) = Aε^ay sin(10πtβy) = lm(Aε^{(a + jβ)y}ε^j10πt)

In this equation, angular frequency ω= 10<π radians per

second, and propagation constant r = a + jβ; the components

of r are positive for an incident wave, with negative values

for a reflected wave. Phase constant β is fixed by the pro-

gram at π/2, thereby fixing the phase wavelength at:

L = (2π/β) = 4 units

Thus, a value of t= 0.1 corresponds to π radians in the phase

angle. Hence, with t = 0.05, the corresponding angle is 90°.

Amplitude A is scaled by the program so that the maximum

amplitude of any wave will tie in the sketch space.