List of top Physics Questions on Electromagnetic waves

Match List-I with List-II :-

List-I EM-Wave	List-II Wavelength Range
(A) Infra-red	(III) 1 mm to 700 nm
(B) Ultraviolet	(II) 400 nm to 1 nm
(C) X-rays	(IV) 1 nm to \(10^{-3}\) nm
(D) Gamma rays	(I) \(<10^{-3}\) nm

Choose the correct answer from the options given below :

Given below are two statements:
Statement I: Electromagnetic waves carry energy as they travel through space and this energy is equally shared by the electric and magnetic fields.
Statement II: When electromagnetic waves strike a surface, a pressure is exerted on the surface. In the light of the above statements.
Choose the most appropriate answer from the options given below:

A particle is moving in a straight line. The variation of position \( x \) as a function of time \( t \) is given as\[x = (t^3 - 6t^2 + 20t + 15) \, \text{m}.\]The velocity of the body when its acceleration becomes zero is:

An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity \(6 \times 10^8 \, \text{W/m}^2\) falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space = \(3 \times 10^8\) m/s) :

Match List I with List II

Choose the correct answer from the options given below :

An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :

If frequency of electromagnetic wave is 60 MHz and it travels in air along z direction then the corresponding electric and magnetic field vectors will be mutually perpendicular to each other and the wavelength of the wave (in m) is :

A plane EM wave is propagating along x direction. It has a wavelength of 4 mm. If electric field is in y direction with the maximum magnitude of 60 V m^-1, the equation for magnetic field is:

Monochromatic light of frequency $6 \times 10^{14}$ Hz is produced by a laser. The power emitted is $2 \times 10^{-3}$ W. How many photons per second on average are emitted by the source.(Given $h = 6.63 \times 10^{-34} \, \text{Js}$)

The magnetic field in a plane electromagnetic wave is \[ B_y = (3.5 \times 10^{-7}) \sin \left( 1.5 \times 10^3 x + 0.5 \times 10^{11} t \right) \, \text{T}. \] The corresponding electric field will be:

In the given electromagnetic wave \[ E_y = 600 \sin(\omega t - kx) \, \text{V/m}, \] intensity of the associated light beam is (in W/m$^2$); (Given $\epsilon_0 = 9 \times 10^{-12} \, \text{C}^2 \text{N}^{-1} \text{m}^{-2}$).

The electric field in an electromagnetic wave is given by \[ \vec{E} = \hat{i} 40 \cos \omega \left( t - \frac{z}{c} \right) \, \text{NC}^{-1}.\]The magnetic field induction of this wave is (in SI unit):

The electric field of a plane electromagnetic wave in a medium is given by

where c is the speed of light in free space. E field is polarized in the x −z plane. The speed of the wave is v in the medium. Then:

A positive, singly ionized atom of mass number \(A_M\) is accelerated from rest by the voltage \(192 V\). Thereafter, it enters a rectangular region of width 𝑤 with magnetic field \(\bar{B_0} = 0.1𝑘̂\)Tesla, as shown in the figure. The ion finally hits a detector at the distance 𝑥 below its starting trajectory. [Given: Mass of neutron/proton =\((5/3) × 10^{−27}\) kg, charge of the electron \(= 1.6 × 10^{−19} C.\)]

Which of the following option(s) is(are) correct?

\( \text{ The electric field of an EM wave in free space is given by } E = 10 \cos(10^7 t + kx) \, \hat{j} \, \text{V/m, where } t \text{ and } x \text{ are in seconds and meters, respectively. It can be inferred that:}\)
Which of the following pairs of statements are correct:
(A) Wavelength λ is 188.4 m,
(B) Wave number k is 0.33 rad/m,
(C) Wave amplitude is 10 V/m,
(D) Wave is propagating along +x-direction.

Match Column-1 with Column-2. In the table given below, certain EM waves are listed in Column-1 and their uses in Column-2 not necessarily in that order.

Choose the correct matching of waves and their uses from the options given below:

Match Electromagnetic waves listed in Column I with Production method/device in Column II.

The correctly matched combination is as in option :

In an electromagnetic wave, the ratio of energy densities of electric and magnetic fields is ______.
Fill in the blank with the correct answer from the options given below

Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area \( A \). If \( I \) is the intensity of the incident electromagnetic radiation and \( c \) is the speed of light in vacuum, the force exerted by the electromagnetic wave on the reflecting surface is

A source produced electromagnetic wave of frequency 60MHz. Find the wavelength of this wave in air.

If the ratio of relative permeability and relative permittivity of a uniform medium is \(1 : 4\). The ratio of the magnitudes of electric field intensity (\(E\)) to the magnetic field intensity (\(H\)) of an EM wave propagating in that medium is:
\[ \text{Given that } \sqrt{\frac{\mu_0}{\epsilon_0}} = 120 \pi : \]

The electromagnetic radiation which has the smallest wavelength are

Find the ratio of K.E. and P.E. when a particle performs SHM and is at \( \frac{1}{n} \) times its amplitude from the mean position.

A wheel of diameter 20 cm is rotating at 600 rpm. The linear velocity of a particle at its rim is: