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# In a plane electromagnetic wave, the electric field oscillates sinusoidal at a frequency of $2.0 \times 10^{10}\;Hz$ and amplitude $48 vm^{-1}$. What is the wavelength of the wave ?

$\begin{array}{1 1} 1.5 \times 10^{-2} m \\ 1.5 \times 10^{-3} m \\ 1.5 \times 10^{-2} m \\ 1.5 \times 10^{-4} m \end{array}$

$\alpha= 2.0 \times 10^{16} Hz$
$E_0= 48 \;vm^{-1}$
$c= 3 \times 10^8\;ms^{-1}$
$\lambda= \large\frac{c}{v}$
$\qquad= \large\frac{3 \times 10^8}{2.0 \times 10^{10}}$
$\qquad= 1.5 \times 10^{-2} m$