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Practice each question, then open the answer or worked solution.
One requires 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in
a) visible region
b) infrared region
c) ultraviolet region
d) microwave region
c) ultraviolet region
A linearly polarized electromagnetic wave given as
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
a)
b)
c)
d)
b)
Light with an energy flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30cm2, the total momentum delivered during 30 minutes is
a) 36 × 10-5 kg m/s
b) 36 × 10-4 kg m/s
c) 108 × 104 kg m/s
d) 1.08 × 107 kg m/s
b) 36 × 10-4 kg m/s
The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is
a) E/2
b) 2E
c) E/√2
d) √2E
c) E/√2
If E and B represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of the electromagnetic wave is along
a) E
b) B
c) B × E
d) E × B
d) E × B
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is
a) c: 1
b) c2 : 1
c) 1: 1
d) √c: 1
c) 1: 1
An EM wave radiates outwards from a dipole antenna, with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as
c) 1/r
Multiple Choice Questions IIAn electromagnetic wave travels in vacuum along z-direction:
. Choose the correct options from the following:
a) the associated magnetic field is given as
d) the given electromagnetic waves is plane polarised
An electromagnetic wave travelling along the z-axis is given as: E = E0 cos (kz – ꞷt). Choose the correct options from the following
a) the associated magnetic field is given as
b) the electromagnetic field can be written in terms of the associated magnetic field as
c)
d)
a) the associated magnetic field is given as
b) the electromagnetic field can be written in terms of the associated magnetic field as
c)
A plane electromagnetic wave propagating along x-direction can have the following pairs of E and B
a) Ex, By
b) Ey, Bz
c) Bx, Ey
d) Ez, By
b) Ey, Bz
d) Ez, By