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Recent questions and answers in Electromagnetic waves
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CBSE XII
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Physics
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Electromagnetic waves
Find the wave length of EM wave of frequency $ 6 \times 10^{12}\;Hz$ in free space .
cbse
class12
physics
ch8
sec-a
additional
easy
answered
Aug 22, 2016
by
meena.p
1
answer
A light have a wavelength of $6000^{\circ} A $ What is the energy of this light
cbse
class12
physics
ch8
sec-a
additional
easy
answered
Aug 22, 2016
by
meena.p
1
answer
give relation with the E.M waves travel?
cbse
class12
physics
ch8
sec-a
additional
easy
answered
Aug 22, 2016
by
meena.p
1
answer
In a plane electro magnetic wave the electric field oscillates simultaneously at a frequency $3 \times 10^{10} Hz $ and amplitude $50\;v/m$ what is the wave length of the wave
cbse
class12
physics
ch8
sec-a
additional
easy
logical reasoning
answered
Aug 22, 2016
by
meena.p
1
answer
A plane electro magnetic wave of frequency $25\;MHz$ travels in free space along the x- direction At a particular point in space and time the electric vector $\overrightarrow{E}= 6.3 v/m \hat j$. calculate $\overrightarrow{B}$ at this point .
cbse
class12
physics
ch8
sec-b
additional
medium
answered
Aug 22, 2016
by
meena.p
1
answer
You are given a $2 \mu F$ parallel plate capacitor .How would you establish an instantaneous displacement current of $1\;MA$ in the space between its plate ?
cbse
class12
physics
ch8
sec-b
exemplar
medium
answered
Aug 22, 2016
by
meena.p
1
answer
What feature of electromagnetic waves led Maxwell to conclude that light itself is electro magnetic wave ?
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 22, 2016
by
meena.p
1
answer
An E.m wave with poynting vector $6\;walt/m^2$ absorbed by a surface of area $12\;m^2$ Find the force on the surface .
cbse
class12
physics
ch8
sec-b
additional
medium
answered
Aug 22, 2016
by
meena.p
1
answer
The magnetic field of a beam emerging from a filter facing a flood light is given by $B = 12 \times 10^{-8} \sin (1.20 \times 10^7\;z -3.60 \times 10^{15}t)T$ What is the average intensity of the beam ?
cbse
class12
physics
ch8
sec-b
exemplar
medium
answered
Aug 22, 2016
by
meena.p
1
answer
Electromagnetic wave with wave length $ \lambda$ is used to improve visibillity in runways during fog and most condition
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
Electromagnetic wave with wave length $ \lambda$ is used to detect leakage of oil in underground pipe lines
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
Electromagnetic wave with wave length $ \lambda$ is used to kill germs in water purifier
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
Electromagnetic wave with wave length $ \lambda$ is used in satellite communication . Identify and name the part of electromagnetic spectrum to which these radiation belong
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
A variable frequency a.c source is connected to a capacitor .How will the displacement current change with decrease in frequency ?
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
The charge on a parallel plate capacitor varies as $q= q_0 \cos 2 \pi \gamma t$ The plates are very large and close together (area aa , separation =d) Neglecting the edge effects, find the displacement current through the capacitor ?
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 20, 2016
by
meena.p
1
answer
Why does microwave over heats up a food item containing water molecules more efficiently ?
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
Why is the orientation of the protable radio with respect to broad casting station important ?
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
The source of electromagnetic waves can be a charge
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
A changed particle oscillates about its means equilibrium position with a frequency of $10^9$ Hz. The electromagnetic wave produced
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 20, 2016
by
meena.p
1
answer
A plane electro magnetic wave propagating along x - direction can have following pair of $\overrightarrow{E}$ and $\overrightarrow{B}$
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 20, 2016
by
meena.p
1
answer
An electro magnetic wave travels in vacuum along z direction $\overrightarrow{E}=(E_1 \hat i +E_2 \hat j) \cos (kz- wt)$ Choose the correct option from the following
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 20, 2016
by
meena.p
1
answer
An EM wave radiation outwards from a dipole antenna with $E_0$ as the amplitude of its electric field vector . The electric field $E_0$ which transports significant energy from the source falls off as
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 19, 2016
by
meena.p
1
answer
If $\overrightarrow{E}$ and $\overrightarrow{B}$ represent electric and magnetic field vectors of the electro magnetic wave is along
cbse
class12
physics
ch8
sec-a
exemplar
easy
answered
Aug 19, 2016
by
meena.p
1
answer
The electric field intensity produced by the radiation coming from $100\;w$ bulls at a $3\;m$ distance is E. The electric field intensity produced by the radiation coming from 50 w bulb at the same distance is :
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 19, 2016
by
meena.p
1
answer
Light with an energy flux of $20w/cm^2$ falls on a non- reflectiy surface has an area of $30\;cm^2$ , the total momentum delivered (for complete absorption ) during 30 minutes is
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 19, 2016
by
meena.p
1
answer
The ratio of contribution made by the electric and magnetic field components to the intensity of an EM wave is
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 19, 2016
by
meena.p
1
answer
A linearly polarized electromagnetic wave given as $E=E_0 \hat i \cos (kz-wt)$ is incident normally on a perfectly reflecting infinite wall at $z=a$ Assuming that the material of the wall is optically inactive , the reflected wave will be given as
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 19, 2016
by
meena.p
1
answer
One requires $11\;ev$ of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve dissociation lies in
cbse
class12
physics
ch8
sec-a
exemplar
medium
answered
Aug 18, 2016
by
meena.p
1
answer
Some scientists have predicted that a global nuclear war on the earth would be followed by a severe nuclear winter with a devastating effect on life on earth. What might be the basis of their prediction ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
If the earth did not have atmosphere would its average temperature be higher or lower than it is now ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
The small ozone layer on the top of the atmosphere is for human survival on why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
Optical and radio telescopes are built on the ground but x- ray astronomy is possible only from satellite orbiting the earth . why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
It is necessary to use satellites for long distance T.V transmission . Why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
Long distance ratio broad casts use short wave bands why ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
State the parts of e.m spectrum to which $14.4\;kev$ (energy of a particular transition $Cn Fe^{57} $ nucleus associated with a famous high resolution spectroscopic method Massbauer spectroscopy ]
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
State the parts of e.m spectrum to which $5890^{\circ} A - 5896 ^{\circ} A$ (double lines of sodium).
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
State the parts of e.m spectrum to which $2.7 \;k$ (temperature with isotropic radiation filly all space - through to be a relic of the big bang origin of the universe ).
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
State the part of the spectrum to which $1057\;MHz$ [frequency of radiation arising from two close energy levels in hydrogen known as lamb shift .
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
State the part of the spectrum to which $21\;cm$ (wave length emitted by atomic hydrogen in interstellar space)
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
About $5\%$ of the power of a low light bulb is converted to visible radiation . What is the average intensity of visible radiation , at a distance of $10\;m$. Assume that the radiation is emitted isotropic-ally and neglect reflection .
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
About $5\%$ of the power of a low light bulb is converted to visible radiation . What is the average intensity of visible radiation , at a distance of 1m from the bulb ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the amplitude of the magnetic field part of the wave ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ write an expression for the magnetic field part of the wave
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 18, 2016
by
meena.p
1
answer
Suppose that the electric field part of an electromagnetic wave in vaccum is $E= 3.1 \times N/c $ an $[(1/8 rad/m)y +(5.4 \times 10^8\;rad/s/t)$ what is the direction of motion ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 17, 2016
by
meena.p
1
answer
In a plane electromagnetic wave, the electric field oscillates sinusoidal at a frequency of $2.0 \times 10^{10}\;Hz$ and amplitude $48 vm^{-1}$. What is the wavelength of the wave ?Show that the total average energy density of magnetic field $( c= 3 \times 10^8 ms^{-1})$
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 17, 2016
by
meena.p
1
answer
In a plane electromagnetic wave, the electric field oscillates sinusoidal at a frequency of $2.0 \times 10^{10}\;Hz$ and amplitude $48 vm^{-1}$. What is the wavelength of the wave ?
cbse
class12
physics
ch8
sec-b
ncert
easy
answered
Aug 17, 2016
by
meena.p
1
answer
Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120 N/C$ and its frequency is $\gamma = 50.0 \;MHz$ . Find the expression of $\overrightarrow{E}$ and $\overrightarrow{B}$
cbse
class12
physics
ch8
sec-b
ncert
easy
answered
Aug 17, 2016
by
meena.p
1
answer
Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120 N/C$ and its frequency is $\gamma = 50.0 \;MHz$ . Determine $B_0, w,k$ and $\lambda$
cbse
class12
physics
ch8
sec-b
ncert
easy
answered
Aug 17, 2016
by
meena.p
1
answer
The amplitude of the magnetic field part of a harmonic electro magnetic wave in vaccum is $B_0 =510\;nT$. What is the amplitude of the electric field part of the wave ?
cbse
class12
physics
ch8
sec-a
ncert
easy
answered
Aug 17, 2016
by
meena.p
1
answer
A changed particle oscillates about its mean equilibrium position with a frequency of $10^9\;Hz$. What is the frequency of electromagnetic waves produced by the oscillator ?
cbse
class12
physics
ch8
sec-a
ncert
easy
asked
Aug 17, 2016
by
meena.p
1
answer
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