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The magnetic field intensity of a uniform plane wave in air is 20 A/m along the $\hat{a_{y}}$ direction.The wave is propagating in the $\hat{a_{z}}$ direction at a frequency of $2\times 10^9 rad/sec$

Find the

1. Wavelength
2. Frequency
3. Period and
4. Amplitude of $\overline{E}$