Electromagnetic Waves MCQs for NEET — Physics Questions with Answers

The penetration power of X-ray increases with the increases in its :

The shortest wavelength of X-rays emitted from an X-ray tube depends upon

X-rays are not used for radar purposes, because they are not 

The energy of the X-rays photon is 3.3$\times {10}^{-16}$J. Its frequency is :

In X-ray tube, the accelerating potential applied at the anode is V volt. The minimum wavelength of the emitted X-ray will be :

If a source is transmitting an electromagnetic wave of frequency $8.2\times {10}^6 Hz$, then the wavelength of the electromagnetic wave transmitted from the source will be :

A plane electromagnetic wave

$E_z=100 \cos (6\times {10}^{8}t+4x) V/m$

propagates in a medium of dielectric constant

If ${\mu }_0$ be the permeability and $K_0$ the dielectric constant of a medium, its refractive index is given by

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

The magnetic field between the plates of radius 12 cm separated by a distance of 4 mm of a parallel plate capacitor of capacitance 100 pF along the axis of plates having conduction current of 0.15 A is