List of top Physics Questions on Electromagnetic Spectrum asked in KEAM

A radio can tune in to any station in the 7.5 MHz to 12 MHz band. The corresponding wavelength band is
Microwaves are
Identify the two electromagnetic waves A and B having respective wavelengths 2 cm and 580 nm
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.
The electromagnetic waves used in radar systems for aircraft navigation are
If work function of a metal is 6.6 eV, find the threshold wavelength. \text{Given} \( h = 6.6 \times 10^{-34} \, \text{J} \cdot \text{s} \).
The transverse nature of electromagnetic waves is confirmed by the phenomenon of
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 \(\text{W m}^{-2}\))
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:
If \( v_g, v_X \) and \( v_v \) are the speeds of gamma rays, X-rays and visible light respectively in vacuum, then
The vibrations of atoms and molecules produce electromagnetic radiation in the region of
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)
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
The correct order of arrangement of electromagnetic waves according to their wavelengths is
Electromagnetic waves of frequency \( 5 \times 10^{14} \, {Hz} \) lie in the
If an electromagnetic wave of frequency \(5\) MHz travels from vacuum into a dielectric medium of electric permittivity \(\varepsilon_r=4\), then its
Among the following, which is not true for ultraviolet light?
Choose the wrong statement.
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?
An electromagnetic wave of intensity $I$ is incident on a non-reflecting surface. If $C$ is the speed of light in free space, then, the ratio $\frac{I}{C}$ is same as
Wavelength of the wave with $30$ MHz frequency is
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}
The direction of propagation of electromagnetic wave is along
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
The speed of light in vacuum is equal to