MCQ
The electromagnetic waves travel with a velocity
  • A
    Equal to velocity of sound
  • Equal to velocity of light
  • C
    Less than velocity of light
  • D
    None of these

Answer

Correct option: B.
Equal to velocity of light
b
(b) Velocity of $EM$ waves =$\frac{1}{{\sqrt {{\mu _0}{ \in _0}} }}3 \times {10^8}m/s$ = velocity of light

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

Similar questions

Intensity level $200 cm$ from a source of sound is $80 dB$. If there is no loss of acoustic power in air and intensity of threshold hearing is ${10^{ - 12}}W{m^{ - 2}}$ then, what is the intensity level at a distance of $400 cm$ from source .... $dB$
Continuous spectrum is not due to
The power obtained in a reactor using $^{235}U$ disintegration is $1000\,\, kW.$ The mass decay of $^{235}U$ per hour is............ $\mu g$
An iron bar of length $L$ has magnetic moment $M$. It is bent at the middle of its length such that the two arms make an angle $60^{\circ}$ with each other. The magnetic moment of this new magnet is :
The maximum $"F"$ which will not cause motion of any of the blocks. ...... $N$
A capacitor stores $60\ \mu C$ charge when connected across a battery. When the gap between the plates is filled with a dielectric , a charge of $120\ \mu C$ flows through the battery. The dielectric constant of the material inserted is :
Two cells, $e.m.f.$ of each is $E$ and internal resistance $r$ are connected in parallel between the resistance $R$. The maximum energy given to the resistor will be, only when
Gauss is unit of which quantity
In Millikan's oil drop experiment, a charged drop falls with terminal velocity $V$. If an electric field $E$ is applied in vertically upward direction then it starts moving in upward direction with terminal velocity $2V$.If magnitude of electric field is decreased to $\frac{E}{2}$, then terminal velocity will become
In a uniform electric field, a cube of side $1\ cm$ is placed. The total energy stored in the cube is $8.85\ \mu J.$ The electric field is parallel to four of the faces of the cube. The electric flux through any one of the remaining two faces is.