16.2 Exercise 12

The electric field of an electromagnetic wave traveling in vacuum is described by the following wave function: $\overset{\rightarrow}{\mathbf{E}} = \left(5.00 \text{V}/\text{m}\right)$
$\text{cos} \left[k x - \left(6.00 \times 10^{9} \left( \text{s}\right)^{−1}\right) t + 0.40\right] \hat{\mathbf{j}}$ where k is the wavenumber in rad/m, x is in m, t is in s.
Find the following quantities:
(a) amplitude
(b) frequency
(c) wavelength
(d) the direction of the travel of the wave
(e) the associated magnetic field wave