Electromagnetic waves practice · Mixed difficulty

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

The property which is not of an electromagnetic wave travelling in free space is that:

An electromagnetic wave travels along $z$-axis. Which of the following pairs of space and time varying fields would generate such a wave

The electromagnetic waves do not transport

The intensity contribution of electric field in the net intensity of EM wave is I. The value of half of intensity contribution due to magnetic field will be

The reative permeability of glass is 3/8 and the dielectric constant of glass is 8. The refractive index of glass is

Assertion: The average magnitude of Pointing vectors $\overrightarrow{\mathrm{S}}$ is the intensity of electromagnetic wave.

Reason: Poynting vector is given by $\overrightarrow{\mathrm{S}}=\frac{\overrightarrow{\mathrm{E}} \times \overrightarrow{\mathrm{B}}}{2 \mu_0}$.

The intensity of sunlight (in $\mathrm{W} / \mathrm{m}^2$) at the solar surface will be

Laser beams are used to measure long distance because

Identify the correct statements from the following descriptions of various properties of electromagnetic waves.
(A) In a plane electromagnetic wave electric field and magnetic field must be perpendicular to each other and direction of propagation of wave should be along electric field or magnetic field.
(B) The energy in electromagnetic wave is divided equally between electric and magnetic fields.
(C) Both electric field and magnetic field are parallel to each other and perpendicular to the direction of propagation of wave.
(D) The electric field, magnetic field and direction of propagation of wave must be perpendicular to each other.
(E) The ratio of amplitude of magnetic field to the amplitude of electric field is equal to speed of light.
Choose the most appropriate answer from the options given below

The wavelength of infrared rays is of the order of

In a uniform magnetic field of ${10^{ - 5}}T$ in free space, the energy density is u. The electric field which will produce the same energy density in free space is

To establish an instantaneous displacement current of 2 A in the space between two parallel plates of $1\,\mu F$ plates will have to be changed at the rate of

Maxwell’s set of equation encapsulated basic laws such as

The average value of electric energy density in an Electromagnetic Waves is (${E_0}$ is peak value)

Which of the following shows green house effect

The magnetic field between the plate of a capacitor where $r > R$ is given by (where $r$ is the distance from the axis of plates and $R$ is the radius of each plate of capacitor)

A point source of electromagnetic radiation has an average power output of $1500 \mathrm{~W}$. The maximum value of electric field at a distance of $3 \mathrm{~m}$ from this sources in $\mathrm{Vm}^{-1}$ is

Which of the following statement is false for the properties of electromagnetic waves?

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

Dimensions of $\varepsilon_0 \mathrm{~d} \phi / \mathrm{dt}$ is