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...

The electric field a plane electromagnetic wave is given by :$E_{y} = 69sin\left\lbrack 0.6 \times 10^{3}x - 1.8 \times 10^{11}t \right\rbrack V/m$.The expression for magnetic field associated with th...

The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant $k = 3$ and permeability of $\mu = 2\mu_{0}$, is( $\mu_{0} =$ permeability of vacuum)

Match the List-I with List-II List-I List-II A Radio-wave I is produced by Magnetron value B Micro-wave II Due to change in the vibrational modes of atoms C Infrared-wave III Due to inner shell electr...

The electric field of an electromagnetic wave travelling through a medium is given by$\overrightarrow{E}(x,t) = 25sin\left( 2.0 \times 10^{15}t - 10^{7}x \right)\widehat{n}$ then the refractive index ...

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?