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[" SECTION B "],[" 21.Suppose that the e...

[" SECTION B "],[" 21.Suppose that the electric field part of an electromagnetic wave in vacuum is "],[E={(3.1N/C)cos[(1.8rad/m)y+(5.4times10^(6)rad/s)t]}^(2)i.],[" (a) What is the direction of propagation? "],[" (b) What is the wavelength "lambda?]

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