Home
Class 12
PHYSICS
In an electromagnetic wave, the amplitud...

In an electromagnetic wave, the amplitude of electric field is `1 V/m`. The frequency of wave is `5xx10^(14)Hz`. The wave is propagating along `z`-axis. The average energy density of electric field, in `"joule"//m^(3)`,will be

A

`1.1 xx 10^(-11)`

B

`2.2 xx 10^(12)`

C

`3.3 xx 10^(-13)`

D

`4.4 xx 10^(-14)`

Text Solution

Verified by Experts

The correct Answer is:
B
Average energy density= `(1)/(2)epsilon_(0)E^(2)= (1)/(2)epsilon_(0)((E_(0))/(sqrt(2)))^(2)= (1)/(4)epsilon_(0)E_(0)^(2)= (1)/(4) xx 8.85 xx 10^(-12) xx (1)^(2)= 2.2 xx 10^(-12) J//m^(3)`
Promotional Banner

Similar Questions

Explore conceptually related problems

In an electromagnetic wave, the amplitude of electric field is 10 V/m. The frequency of wave is 5 x10^(14) Hz, the wave is propagating along z–axis, then total average energy density of E.M. wave is

In an electromagnetic wave, the amplitude of electric field is 10V//m . The frequency of wave is 5xx10^14Hz . The wave is propagating along Z-axis, find (i) the average energy density of electric field (ii) the average energy density of magnetic field (iii) the total average energy density of EM wave.

In a plane e.m. wave, the electric field varies with time having an amplitude 1Vm^-1 . The frequency of wave is 0.5xx10^(15) Hz . The wave is propagating along Z-axis. What is the average energy density of (i) electric field (ii) magnetic field (iii) total (iv) what is the amplitude of magnetic field?

In an electromagnetic wave, the amplitude of magnetic field is 3xx10^(-10)T . If the frequency of the waves is 10^(12)Hz , then the amplitude of the associated electrical field will be :-

The electric field of a plane electromagnetic wave varies with time of amplitude 2Vm^-1 propagating along z-axis. The average energy density of the magentic field is (in Jm^-3 )

In an electromagnetic wave, the electric field is 100 V/m. The maximum intensity flow will be (1)/(mu_(0)) times of

The electric field of a plane electromagnetic wave varies with time of amplitude 3 V m^(-1) propagating along z-axis. The average energy density of the magnetic field in ("in J m"^(-3))

In an electromagnetic wave, the amplitude of electri field is 1 V/m, What is (i) the amplitude of magnetic field? (ii) average energy density of electric field ? (iii) average energy density of magnetic field ? (iv) average energy density of wave ?

In an electromanetic wave, the average energy density associated with electric field is

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0xx10^10 Hz and amplitude 48Vm^(-1) . The total energy density of the electromagnetic field of the wave is :