Electromagnetic waves practice · Medium

In an electromagnetic wave, the direction of the magnetic field induction $\vec{B}$ is

The electromagnetic waves generally used in the purification of water are

Which of the following electromagnetic wave play an important role in maintaining the earth’s warmth or average temperature through the greenhouse effect?

Find the displacement current developed in the space between the plates of parallel plate capacitor of capacity $2 \mu \mathrm{F}$ when voltage is changing at a rate of $10^6 \mathrm{Vs}^{-1}.$

Which rays are not part of electromagnetic spectrum?

The part of the spectrum of the electromagnetic radiation used to cook food is

The wave function (in S.I units) for an electromagnetic wave is given as $- \psi \left( {X,t} \right) = {10^3}\sin \pi \left( {3 \times {{10}^6}X - 9 \times {{10}^{14}}t} \right)$. The speed of wave is :

The charge of a parallel plate capacitor is varying as $q = {q_0}\sin 2\pi ft$. The plates are very large and close together (area$= A$, separation$= d$). Neglecting edge effects, the displacement current through the capacitor is

The electromagnetic waves travel with a velocity

Find the values of magnetic field between plates of capacitor at distance $1 \mathrm{~m}$ from centre where electric field varies by $10^{10}$ volt $/ \mathrm{m} / \mathrm{s}$.

Assertion: During discharging there is magneticfield between plates of capacitor.

Reason : Time varying electric field produces magnetic field.

Which of the following statements about electromagnetic waves is/are correct?

(1) X-rays in vacuum travel faster than light waves in vacuum.

(2) The energy of X-ray photon is greater than that of a light photon

(3) Light can be polarised but X-ray cannot.

A radar sends the waves towards a distant object and receives the signal reflected by object. These waves are

The maximum electric field in a plane electromagnetic wave is $600 \mathrm{~NC}^{-1}$. The wave is going in the $x$-direction and the electric field is in the $y$-direction. Find the maximum magnetic field in the wave and its direction.

What physical quantity is the same for $\mathrm{X}$-rays of wavelength ${10^{-10}} \mathrm{~m}$, red light of wavelength $6800 ~\mathop {\text{A}}\limits^ \circ$, and radiowaves of wavelength $500 \mathrm{~m}$?

An electromagnetic wave is propagating along $\mathrm{Y}$-axis. Then

$50\mathrm{ W/}{\mathrm{m}^2}$ energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on $\mathrm{1 }{\mathrm{m}^\mathrm{2}}$ surface area will be close to $(c = 3 \times {10^8}{\rm\,\,{m/s)}}$

For an electromagnetic wave traveling in free space

An EM wave radiates outwards from a dipole antenna with $E_0$ as the amplitude of its electric field vector. The electric field $E_0$ which transports significant energy from the source falls off as

Assertion: A changing electric-field produces a magnetic field.

Reason: A changing magnetic field produces an electric field.

Consider an electric charge oscillating with a frequency o $10 \mathrm{MHz}$. The radiation emitted will have a wavelength equal to

The speed of electromagnetic wave is

If ${\varepsilon _0}$ and ${\mu _0}$ represent the permittivity and permeability of vacuum and $\varepsilon$ and $\mu$ represent the permittivity and permeability of medium, then refractive index of the medium is given by

Which of the following is absorbed by the ozone layer?

Which of the following is/are the property/properties of a monochromatic electromagnetic wave propagating in the free space?

I. Electric and magnetic fields will have a phase difference $\frac{\pi}{2}$.

II. The energy of the wave is distributed equally between electric and magnetic fields.

III. The pressure exerted by the wave is the product of its speed and energy density.

IV. The speed of the wave is equal to the ratio of the magnetic field to the electric field.

The velocity of electromagnetic radiation in a medium of permittivity ${\varepsilon _0}$ and permeability ${\mu _0}$ is given by

Assertion: MRI is an excellent method to find problem in internal tissues.

Reason : Two third of the human body is made up of hydrogen which has one electron.

If ${\varepsilon _0}$ and ${\mu _0}$ are respectively, the electric permittivity and the magnetic permeability of free space, $\varepsilon$ and $\mu$ the corresponding quantities in a medium, the refractive index of the medium is

The idea of the quantum nature of light has emerged in an attempt to explain

Identify the mismatched pair in electromagnetic wave spectrum