Embibe Experts Solutions for Chapter: Electromagnetic Waves, Exercise 1: KEAM 2019

If an electromagnetic wave of frequency $5 \mathrm{MHz}$ travels from vacuum into a dielectric medium of electrical permittivity $\left.{\mathrm{\epsilon }}_{\mathrm{r}}=4,\text{ then its (take }{\mathrm{\mu }}_{\mathrm{r}}=1\right)$

If ${\mathrm{\epsilon }}_0$ and ${\mathrm{\mu }}_0$ are respectively the electrical permittivity and magnetic permeability of vacuum, the dimensional formula for $\frac{1}{\sqrt{{\mathrm{\mu }}_0{\mathrm{\epsilon }}_0}}$ is

The electric field of an electromagnetic wave in free space is given by $E=5\sin \left(\frac{2\mathrm{\pi }}{3}z-\omega t\right)\hat{\mathrm{y}}$ $\mathrm{V}/\mathrm{m}.$ Which of the following statements is correct ?

A radio transmitter sends out $60W$ of radiation. Assuming that the radiation is uniform on a sphere with the transmitter at its centre, the intensity $\left(\mathrm{i}\mathrm{n}\mathrm{ }W/m^2\right)$ of the wave at a distance $12 km$ is

Among the following, which is not true for ultraviolet light?