The electric field of a plane wave propagating in a loss-less, non-magnetic dielectric material with εr = 2.56 is given by:

\(\vec E = 100\cos (6\pi \times {10^9}t - kz){\widehat a_x}V/m\)

The wavelength λ (in cm) in the material is _________.

Enter numerical value using the virtual keypad. Round off where necessary.

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