KCET 2024 | Electromagnetic Waves Question 3 | Physics

Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area $A$. If $I$ is the intensity of the incident electromagnetic radiation and $c$ is the speed of light in vacuum, the force exerted by the electromagnetic wave on the reflecting surface is

$2 I A / c$

$L A / C$

$I A / 2 c$

$I / 2 A c$

KCET 2023

MCQ (Single Correct Answer)

-0

The ratio of the magnitudes of electric field to the magnetic field of an electromagnetic wave is of the order of

10$$^{-8}$$ ms$$^{-1}$$

10$$^{5}$$ ms$$^{-1}$$

10$$^{-5}$$ ms$$^{-1}$$

10$$^{8}$$ ms$$^{-1}$$

KCET 2022

MCQ (Single Correct Answer)

-0

Which of the following radiations of electromagnetic waves has the highest wavelength ?

UV-rays

IR-rays

Microwaves

X-rays

KCET 2021

MCQ (Single Correct Answer)

-0

Suppose that the electric field amplitude of electromagnetic wave is $$E_0=120 \mathrm{~NC}^{-1}$$ and its frequency $$f=50 \mathrm{~MHz}$$. Then, which of the following value is incorrectly computed?

Magnetic field amplitude is $$400 \mathrm{nT}$$.

Angular frequency of EM wave is $$\pi \times 10^8 \mathrm{rad} / \mathrm{s}$$.

Propagation constant (angular wave number) is $$2.1 \mathrm{~rad} / \mathrm{m}$$.

Wavelength of EM wave is $$6 \mathrm{~m}$$.

PREVIOUS NEXT

KCET Subjects