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In radio-communication, the signals emit...

In radio-communication, the signals emitted by transmitting antenna are reflected on

A

stratosphere

B

ozonosphere

C

ionosphere

D

troposphere

Text Solution

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The correct Answer is:
C
The lower atmosphere is more or less transparent to radio waves. However, the lonosphere reflects back the radio waves. Thus, a signal emitted by an antenna from a certain place can be received at another place on the surface of Earth in the following two ways: ground wave propagation and sky wave propagation.
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Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. The cordless phone installed in a house uses

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Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. A receiver receives a signal of frequency 108 MHz from a transmitter 300 km away. It must be coming via

In a line of sight radio communication, a distance of about 50 is Kept between the transmitting and receiving entennas. If the height of the receiving antenna is 70m , then the minimum height fof the transmitting antenna should be: ("Radius of the Earth"=6.4xx10^(6)m) .

The maximum range for the tropospheric transmission of radio wave of wavelength 3m using the transmitting antenna and receiving antenna of heights 100 m and 60 m respectively is

A carrier wave of 2000 kHz is used to carry the signal, the length of the transmitting antenna will be equal to

If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to -

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