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List of top Physics Questions on Electromagnetic Spectrum asked in KEAM
Identify the two electromagnetic waves A and B having respective wavelengths 2 cm and 580 nm
KEAM - 2026
KEAM
Physics
Electromagnetic Spectrum
If the force due to sun's radiation on surface area of \(cm^{2}\) is about \(9 \times 10^{-9} N\), then the radiation pressure of the sun's radiation (in \(Nm^{-2}\)) is.
KEAM - 2026
KEAM
Physics
Electromagnetic Spectrum
The transverse nature of electromagnetic waves is confirmed by the phenomenon of
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
A \(1\) kW bulb radiates light uniformly in all directions. The intensity at a point on the surface of the surrounding sphere of area \(200\,\text{m}^2\) is (in \(\text{W m}^{-2}\))
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
An electromagnetic wave travelling in vacuum has its electric field component, $E=15\sin(1.57y+5.4t)\hat{j}$. The wavelength of the wave is:
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
If \( v_g, v_X \) and \( v_v \) are the speeds of gamma rays, X-rays and visible light respectively in vacuum, then
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
The vibrations of atoms and molecules produce electromagnetic radiation in the region of
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
The velocity of light in a medium of relative permittivity 2 and relative permeability 4.5 is (velocity of light in free space is c)
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
In a plane electromagnetic wave, the magnetic field is given by \(B = 400 \times 10^{-6}\sin[(4.0 \times 10^{-4})(t - x/c)]\). The peak value of electric field (in V m\(^{-1}\)) is
KEAM - 2025
KEAM
Physics
Electromagnetic Spectrum
If an electromagnetic wave of frequency \(5\) MHz travels from vacuum into a dielectric medium of electric permittivity \(\varepsilon_r=4\), then its
KEAM - 2020
KEAM
Physics
Electromagnetic Spectrum
Among the following, which is not true for ultraviolet light?
KEAM - 2020
KEAM
Physics
Electromagnetic Spectrum
Choose the wrong statement.
KEAM - 2020
KEAM
Physics
Electromagnetic Spectrum
The electric field of an electromagnetic wave in free space is given by \( \vec{E} = 5\sin\left(\tfrac{2\pi}{3}z - \omega t\right)\hat{y} \) V/m. Which of the following statements is correct?
KEAM - 2019
KEAM
Physics
Electromagnetic Spectrum
Wavelength of the wave with $30$ MHz frequency is
KEAM - 2017
KEAM
Physics
Electromagnetic Spectrum
The electric field portion of an electromagnetic wave is given by (all variables in SI units) $E = 10^{-4} \sin (6 \times 10^5 t - 0.01 x)$. The frequency $(f)$ and the speed $(v)$ of electromagnetic wave are}
KEAM - 2017
KEAM
Physics
Electromagnetic Spectrum
The direction of propagation of electromagnetic wave is along
KEAM - 2017
KEAM
Physics
Electromagnetic Spectrum
Assume that a radio station is about $200$ km away from your location and the station operates at $972$ kHz. How long does it take for an electromagnetic signal to travel from the station to you and how many wave crests does it send out per second
KEAM - 2017
KEAM
Physics
Electromagnetic Spectrum
The speed of light in vacuum is equal to
KEAM - 2017
KEAM
Physics
Electromagnetic Spectrum
If the direction of electric and magnetic field vectors of a plane electromagnetic wave are along positive $y$ direction and positive $z$ direction respectively, then the direction of propagation of the wave is along
KEAM - 2016
KEAM
Physics
Electromagnetic Spectrum
The amplitudes \(E_0\) and \(B_0\) of electric and magnetic components of an electromagnetic wave respectively are related to the velocity \(c\) in vacuum as
KEAM - 2015
KEAM
Physics
Electromagnetic Spectrum
In a plane electromagnetic wave, the electric field of amplitude \( 1 \text{ V m}^{-1} \) varies with time in free space. The average energy density of magnetic field is (in \( \text{Jm}^{-3} \))
KEAM - 2014
KEAM
Physics
Electromagnetic Spectrum
Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?
KEAM - 2014
KEAM
Physics
Electromagnetic Spectrum
In a plane electromagnetic wave, the electric field of amplitude \( 1 \text{ V m}^{-1} \) varies with time in free space. The average energy density of magnetic field is (in \( \text{Jm}^{-3} \))
KEAM - 2014
KEAM
Physics
Electromagnetic Spectrum
Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?
KEAM - 2014
KEAM
Physics
Electromagnetic Spectrum
Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?
KEAM - 2014
KEAM
Physics
Electromagnetic Spectrum
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