Compare with the Standard Wave Equation:The general equation for a plane electromagnetic wave travelling along the x-axis is given by:$$B = B_0 \sin(\omega t - kx)$$Comparing this with the given equation:$$B = 5 \times 10^{-8} \sin(3 \times 10^{10} t - 150 x)$$Extract the Wave Parameters:Angular frequency ($\omega$) = $3 \times 10^{10} \text{ rad s}^{-1}$Propagation constant / Wave number ($k$) = $150 \text{ rad m}^{-1}$Calculate the Velocity of the Wave:The phase velocity ($v$) of an electromagnetic wave in a medium is related to $\omega$ and $k$ by the formula:$$v = \frac{\omega}{k}$$Substitute the values:$$v = \frac{3 \times 10^{10}}{150} = \frac{3 \times 10^{10}}{1.5 \times 10^2} = 2.0 \times 10^8 \text{ ms}^{-1}$$