The electric field component of a wave in free space is given by E = 10 cos(10

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The electric field component of a wave in free space is given by E = 10 cos(107t + kz)aV/m. It can be inferred that
(a) The wave propagates along ay.
(b) The wavelength λ = 188.5 m.
(c) The wave amplitude is 10 V/m.
(d) The wave number k = 0.33 rad/m.
(e) The wave attenuates as it travels.

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