suppose that the electric field part of an electromagnetic wave in vacuum is:
E vector={(3.1 N/C)cos[(1.8 rad/m)y+(5.4*106rad/s)t]}i
a)what's the direction of propagation
b)find wavelength and frequency of wave
c)what's the amplitude of magnetic field part of the wave
d)write an expression for magnetic field part of the wave
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