Partial Differential Equations

The electric field of a plane wave solution to the wave equation is . E(z,t) = E0 exp(-i[wt-kz]) where k, the wavenumber, = 2p/l, where l is the wavelength and w is the angular frequency in radians per second which is 2p f where f is frequency in cycles per second. The speed of propagation of the phase in the medium is . v = lf = w/k ................
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