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

The frequency range from a few MHz up to 30 to 40 MHz, long distance communication can be achieved by ionospheric reflection of radio waves back towards the earth. This mode of propagation is called sky wave propagation and is used by short wave broadcast services.

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What is skip zone and skip distance?

Important Questions on Communication System

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

The frequency suitable for beyond-the-horizon communication using sky waves is

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

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

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

For television broadcasting the frequency employed is normally in range,

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

Which mode of propagation uses ionosphere to reflect the transmitted signals from the Earth ? State other two modes of propagation.

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

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:

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

The waves suitable for transmission of radio signals are

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

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):

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

Which type of communication is employed in mobile phones?

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Physics>Modern Physics>Communication System>Propagation of Electromagnetic Waves in Atmosphere

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>Communication System>Propagation of Electromagnetic Waves in Atmosphere

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>Communication System>Propagation of Electromagnetic Waves in Atmosphere

An EM wave is propagating in a medium with a velocity