Download App

Wave Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWave Optics1 Mark
MCQ
Electromagnetic waves travel in a medium which has relative permeability $1.3$ and relative permittivity $2.14.$ Then the speed of the electromagnetic wave in the medium will be
  • A
    $13.6 \times 10^6 m / s$
  • B
    $1.8 \times 10^2 m / s$
  • C
    $3.6 \times 10^8 m / s$
  • ✓
    $1.8 \times 10^8 m / s$
✓

Answer

Correct option: D.
$1.8 \times 10^8 m / s$
$v=\frac{c}{\sqrt{\mu_r \varepsilon_r}}=\frac{3 \times 10^8}{\sqrt{1.3 \times 2.14}}=1.8 \times 10^8 m / sec$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Wave Optics→Wave Optics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The angle between the two vectors $\vec{A}=3 \hat{i}+4 \hat{j}+5 \hat{k}$ and $\vec{B}=3 \hat{i}+4 \hat{j}+5 \hat{k}$ is
→
The length of second's hand in watch is $1 cm$. The change in velocity of its tip in 15 seconds is
→
Which of the following spectral series in hydrogen atom give spectral line of $4860 \mathring A$
→
The period of a body under SHM i.e. presented by $T=P^a D^b S^c$; where $P$ is pressure, $D$ is density and $S$ is surface tension. The value of $a, b$ and $c$ are
→
In an isothermal process the volume of an ideal gas is halved. One can say that
→
Two tuning forks $A$ and $B$ vibrating simultaneously produce 5 beats. Frequency of $B$ is 512 . It is seen that if one arm of $A$ is filed, then the number of beats increases. Frequency of $A$ will be
→
During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $C_p / C_v$ for the gas is
→
A body of mass $8\ kg$ is moved by a force $F=3 x N$, where $x$ is the distance covered. Initial position is $x=2 m$ and the final position is $x=10 m$. The initial speed is $0.0 m / s$. The final speed is
→
Characteristic $X$-rays are produced due to
→
The escape velocity for a body projected vertically upwards from the surface of earth is $11 \mathrm{~km} / \mathrm{s}$. If the body is projected at an angle of 45 with the vertical, the escape velocity will be
→