JEE Questions for Physics Electromagnetic Waves Quiz 3

Consider the following statements about electromagnetic radiations; All of them
(i) have energy
(ii) exert pressure on an object
(iii) have the same momentum
Of these statements

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(i), (ii) and (iii) are correct
0%
(i) and (ii) are correct
0%
(ii) and (iii) are correct
0%
(i) and (iii) are correct

Television signals reach us only through the ground waves. The range R related with the transmitter height h is in proportion to

0%
h
0%
2)
0%
0%

In T.V. broadcasting both picture and sound are transmitted simultaneously.
In this

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audio signal is frequency modulated and video signal is amplitude modulated
0%
both audio and video signals are frequency modulated
0%
audio signal is amplitude modulated and video signal is frequency modulated
0%
both audio and video signals are amplitude modulated

Which of the following radiations has the least wavelength?

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γ-rays
0%
β-rays
0%
α-rays
0%
X-rays

Sodium lamps are used in foggy conditions because

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yellow light is scattered less by the fog particles
0%
yellow light is scattered more by the fog particles
0%
yellow light is unaffected during its passage through the fog
0%
wavelength of yellow light is the mean of the visible part of the spectrum

The region of the atmosphere above troposphere is known as

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lithosphere
0%
uppersphere
0%
ionosphere
0%
strato-sphere

If c is the speed of electromagnetic waves in vacuum, its speed v in a medium of dielectric constant K and relative permeability μ_r is

0%
0%
2)
0%
0%

The electric field ( in NC^-1) in an electromagnetic wave is given by E = 50 sin ω (t-x/c) The energy stored in a cylinder of crossection 10 cm² and length 100 cm along the x-axis will be

0%
0%
2)
0%
0%

Who produced the electromagnetic waves first ?

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Marconi
0%
Maxwell
0%
J.C. Bose
0%
Hertz

0%
0%
2)
0%
0%

A plane electromagnetic wave is incident on a material surface. The wave delivers momentum P and energy E

0%
0%
2)
0%
0%

0%
0%
2)
0%
0%

0%
0%
2)
0%
0%

According to Maxwell, a changing electric field produces

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Emf
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Electric current
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Magnetic field
0%
Radiation pressure

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ω
0%
k/ ω
0%
kω
0%
k

Which of the following have zero average value in a plane electromagnetic wave?

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Electric energy
0%
Magnetic energy
0%
Electric field
0%
None of these.

If the relative permeability and dielectric constant of a given medium are equal to l_r and K respectively, then the refractive index of the medium is equal to _____________

0%
0%
2)
0%
0%

0%
14.28 GHz
0%
1.428 kHz
0%
1.428 MHz
0%
1.428 GHz

0%
50
0%
2)
0%
3.3
0%

The amplitude of the electric field in a parallel beam of light of intensity 2.0 Wm^–2 is __________

0%
38.8NC–1
0%
19.4NC–1
0%
9.7NC–1
0%
None of these

Speed of electromagnetic wave is the same

0%
for all wavelengths
0%
in all media
0%
for all intensities
0%
for all frequencies

The maximum electric field in a plane electromagnetic wave is 900NC^–1. The wave is going in the x direction and the electric field is in the y direction. The maximum magnetic field in the wave is _____________T