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Statement 1: Ground wave communication i...

Statement 1: Ground wave communication is effective only at low frequencies in the range 500 kHz to about 1500 kHz
Statement 2: The decrease in the intensity of the signal due to absorption by the earth and its atmosphere is higher for higher frequencies.

A

Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.

B

Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1

C

Statement-1 is true but Statement-2 is false.

D

Statement-1 is false but Statement-2 is true.

Text Solution

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The correct Answer is:
A
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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

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 frequency range allotted to FM radio broadcast is 88 MHz to 108 MHz. Which of the following communication channels can be used for its transmission?

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

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  12. Statement-1 surface wave and sky wave can not be observed on moon. S...

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  13. Statement 1: In ground wave transmission the radio signals die out aft...

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  14. Statement 1: Ground wave communication is effective only at low freque...

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  15. Statement 1: The refractive index of the ionosphere increases as we go...

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  16. Statement 1: Sky wave communication is not suitable for frequencies gr...

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  17. Statement 1: Microwaves and not radiowaves are used in satellite commu...

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  18. Statement 1: Long distance radio broadcasts use short wave bands. St...

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