A plane electromagnetic wave is propagating along the direction i ^ + j ^ 2 , with its polarization along the direction k . ^ The correct form of the magnetic field of the wave would be (here B 0 is an appropriate constant):

B 0 i ^ - j ^ 2 c o s ω t - k i ^ + j ^ 2

B 0 j ^ - i ^ 2 c o s ω t + k i ^ + j ^ 2

B 0 k ^ c o s ω t - k i ^ + j ^ 2

B 0 i ^ + j ^ 2 c o s ω t - k i ^ + j ^ 2

Match List – I with List – II . List – I List – II (a) 10 km height over earth's surface (i) Thermosphere (b) 70 km height over earth's surface (ii) Mesosphere (c) 180 km height over earth's surface (iii) Stratosphere (d) 270 km height over earth's surface (iv) Troposphere

( a )-( iv ), ( b )-( iii ), ( c )-( ii ), ( d )-( i )

( a )-( i ), ( b )-( iv ), ( c )-( iii ), ( d )-( ii )

( a )-( iii ), ( b )-( ii ), ( c )-( i ), ( d )-( iv )

( a )-( ii ), ( b )-( i ), ( c )-( iv ), ( d )-( iii )

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Earn 100

What is the relationship between velocity of light and refractive index?

Important Questions on Space Communication

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Physics>Modern Physics>Space Communication>Space Communication

The earth's atmosphere is divided into different layers. Out of these layers, ionosphere consists of

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Physics>Modern Physics>Space Communication>Space Communication

The physical sizes of the transmitter and receiver antenna in a communication system are:

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Physics>Modern Physics>Space Communication>Space Communication

For television broadcasting the frequency employed is normally in range,

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Physics>Modern Physics>Space Communication>Space Communication

The waves used for line of sight communication are

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Physics>Modern Physics>Space Communication>Space Communication

A plane electromagnetic wave of wavelength

λ

has an intensity

I

. It is propagating along the positive

Y -

direction. The allowed expressions for the electric and magnetic fields are given by:

EASY

Physics>Modern Physics>Space Communication>Space Communication

The waves suitable for transmission of radio signals are

MEDIUM

Physics>Modern Physics>Space Communication>Space Communication

A plane electromagnetic wave is propagating along the direction

\frac{\hat{i} + \hat{j}}{\sqrt{2}},

with its polarization along the direction

\hat{k .}

The correct form of the magnetic field of the wave would be (here

B_{0}

is an appropriate constant):

EASY

Physics>Modern Physics>Space Communication>Space Communication

An EM wave is propagating in a medium with a velocity

\vec{V} = V \hat{i}

. The instantaneous oscillating electric field of this em wave is along

+ y

axis. Then the direction of oscillating magnetic field of the EM wave will be along

MEDIUM

Physics>Modern Physics>Space Communication>Space Communication

A transmitting antenna at the top of a tower has a height $32 m$ and the height of the receiving antenna is $50 m$ . What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode?

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Physics>Modern Physics>Space Communication>Space Communication

Long-range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:

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Physics>Modern Physics>Space Communication>Space Communication

Which type of communication is employed in mobile phones?

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Physics>Modern Physics>Space Communication>Space Communication

A TV transmission tower has a height of

140 m

and the height of the receiving antenna is

40 m .

What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight) mode? (Given: radius of earth

= 6.4 \times 10^{6} m) .

EASY

Physics>Modern Physics>Space Communication>Space Communication

Match List

- I

with List

- II .

	List $- I$		List $- II$
(a)	$10 km$ height over earth's surface	(i)	Thermosphere
(b)	$70 km$ height over earth's surface	(ii)	Mesosphere
(c)	$180 km$ height over earth's surface	(iii)	Stratosphere
(d)	$270 km$ height over earth's surface	(iv)	Troposphere