Electromagnetic Waves

Assertion : When an electron beam strikes the target in an X-ray tube, part of the kinetic energy is converted into X-ray energy. Reason : If the accelerating potential in an $\mathrm{X}$-ray tube is increased, the…

Assume that a radio station is about $200 \mathrm{~km}$ away from your location and the station operates at $972 \mathrm{kHz}$. How long does it take for an electromagnetic signal to travel from the station to you and…

Assertion : The energy of X-ray photon is greater than that of light (visible) photon. Reason : X-ray photon in vacuum travels faster than light photon.

The charge of a parallel plate capacitor is varying as $q=q_0 \sin 2 \pi v t$. The plates are very large and close together. Neglecting edge effects, the displacement current through the capacitor is

Assertion : When a charged particle moves in a circular path. It produces electromagnetic wave. Reason : Charged particle has acceleration.

Assertion : The electromagnetic waves are transverse in nature. Reason : Waves of wavelength $10 \mu \mathrm{m}$ are radiowave and microwave.

The temperature of an object that emits electromagnetic radiation must be

Assertion: Static crashes are heard on radio, when lightning flash occurs in the sky. Reason: Electromagnetic waves having frequency of radio wave range interfere with radio waves.

Assertion : Electromagnetic radiations exert pressure. Reason : Electromagnetic-waves carry both momentum and energy.

Assertion : A laser beam of $0.2 \mathrm{~W}$ power can drill holes through a metal sheet, whereas a $1000 \mathrm{~W}$ torch-light cannot. Reason : The frequency of laser light is much higher than that of torch light.

Astronomical wavelength increase due todoppler effect known as

Assertion : In electromagnetic waves electric field and magnetic field lines are perpendicular to each other.Reason : Electric field and magnetic field are self sustaining.