Electromagnetic Waves Questions

During the propagation of electromagnetic waves in a medium

Out of the following options which one can be used to produce a propagating electromagnetic wave?

For plane electromagnetic waves propagating in the z direction, which one of the following combinationgives the correct possible direction forand field respectively ?...

An electric field of 1500 V/m and a magnetic field of 0.40 weber/metre2 act on a moving electron. The minimum uniform speed along a straight line the electron could have is -...

An electromagnetic wave goin through vaccum is described by E = E0 sin(kx - ωt); B = B0 sin(kx - ωt). Then

A radioactive sample disintegrates by 10% during one month. How much fraction will disintegrate in four months :-

Electromagnetic waves is invented by :-

A radioactive material have 16 × 1010 active nuclei. During a time equals to its three half lives how much nuclei disintegrates -

The electric field of an electromagnetic wave is represented by, Ex = 36 sin (1.20 × 107 z - 3.6 × 1015 t) Volt/m) The average intensity of the wave will be :-...

Activity of radioactive element decreased to one third of original activity R0 in 9 years. After further 9 years, its activity will be :-

Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the ...

An electromagnetic wave of wavelength λ0 (in vacuum) passes from P towards Q crossing three different media of refractive index μ, 2μ and 3μ respectively as shown in figure. φ...

An electromagnetic wave of wavelength λo (in vacuum) passes from P towards Q crossing three different media of refractive index μ, 2μ and 3μ respectively as shown in figure. φ...

In the given diagram, a line of force of a particular force field is shown. Out of the following options, it can never represent...

For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is :-

Consider telecommunication through optical fibers. Which of the following statements is not true?

An electromagnetic wave in vacuum has the electric and magnetic fields , which are always perpendicular to each other. The direction of polarizaiton is given by and that of wave propagation by . Then ...

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wavepropagating in vacuum is equal to

The electric field associated with an e.m. wave in vacuum is given by 40 cos (kz - 6 × 10-8t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is...

The electric and magnetic field, associated with an e.m. wave, propagating along the +z-axis, be represented by