Dimension of $\frac{1}{\mu_0 \varepsilon_0}$ should be equal to

During the propagation of electromagnetic waves in a medium,

The magnetic field of an electromagnetic wave is given by $B_y = 3 \times 10^{-7} \sin(10^3 x + 3 \times 10^{11} t)$,where $x$ is in meters and $t$ is in seconds. The wavelength of the electromagnetic wave is: (in $cm$)

Select the correct statement from the following:

Light is an electromagnetic wave. Its speed in vacuum is given by the expression

Assume a bulb of efficiency $2.5\%$ as a point source. The peak value of the electric field produced by the radiation coming from a $100\, W$ bulb at a distance of $3\, m$ is approximately.....$V\,m^{-1}$.