Electromagnetic...

If c is the speed of electromagnetic waves in vacuum, then their speed in a medium of dielectric constant K and relative permeability μ_r will be

A plane electromagnetic wave of frequency 25 MHz travels in free space along x-direction. At a particular point in space and time, = 6.3 Vm^-1. What is the value of at that point?

Velocity of electromagnetic waves in a medium depends upon

An electromagnetic wave travels along the z-direction. Which of the following pairs of space and time-varying E and B fields would generate such a wave?

The direction of electromagnetic waves is given by

A laser emits a beam of light of 2 mm diameter. If the power of the beam is 10 mW, then find its intensity.

If u_e and u_m respectively are the electric and magnetic field densities in an electromagnetic (EM) wave and 'c' is the speed of light, then

In the absence of atmosphere around Earth, the average surface temperature of Earth

The Poynting vector gives the

The dielectric constant of air is 1.006. The speed of an electromagnetic wave travelling in air is a × 10⁸ms^–1, where a is about

Which of the following electromagnetic waves emitted by the sun are responsible for heating Earth's atmosphere due to greenhouse effect?

The pressure exerted by an electromagnetic wave of intensity I (W/m²) on a non-reflecting surface is
(where c is the velocity of light)

If Earth receives 20 cal min^-1 cm^-2 of solar energy, then what are the respective amplitudes of electric and magnetic fields of radiations? (Use SI units)

At what speed (m/s) does an electron have a de Broglie wavelength of 1.0 nm?

Which of the following electromagnetic waves are used in telecommunication?