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An antenna is a device...

An antenna is a device

A

that concerts electromagnetic energy into radio frequency signal

B

that converts radio frequency signal into electromagnetic energy

C

that converts guided electromagnetic waves into free space electromegnetic waves and vice-versa

D

None of these

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Knowledge Check

  • Sonar is a device for

    A
    Location and ranging of aircrafts·
    B
    Location and ranging of submarines
    C
    Producing a musical Iiote of high quality
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    Measuring frequency of musical notes

  • A transmitting antenna is at a height of 25 m and the receiving antenna is at a height of 64 m .The maximum distance between them for satisfactory communication is nearly

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    `22.5 km`
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    `46.5 km`
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    `50 km`
    D
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  • A transmitting antenna is at a height of 40 m and the receiving antenna is at a height of 60 m .The maximum distance between them for satisfactory communication is nearly

    A
    `22.5 km`
    B
    `27.5 km`
    C
    `50 km`
    D
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