The electric field E associated with an electromagnetic wave is given by $E = E_0\sin(kx - ωt)$. The speed of the wave is

$\frac{ω}{k}$

The correct answer is Option (4) → $\frac{ω}{k}$ **

Given electromagnetic wave:

$E = E_0 \sin(kx - \omega t)$

General wave equation form:

$E = E_0 \sin(kx - \omega t)$ → wave speed $v = \frac{\omega}{k}$

Final Answer:

$v = \frac{\omega}{k}$