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The critcal frequency for sky wave propa...

The critcal frequency for sky wave propagation if maximum number density of electrons in ionosphere is `10^(3) m_(-3)` is

A

300 kHz

B

600 kHz

C

900 kHz

D

1 MHz

Text Solution

Verified by Experts

The correct Answer is:
C
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A ground receiver station is receiving a signal at (a) 6.0 MHz and (b) 110 MHz, transmitted from ground transmitter at a hight of 300 m located at a distance of 100 km. Identify whether it is coming via space wave or sky wave propagation or satellite transponder. Radius of earth = 6.4 xx 10^6m , maximum number density of electrons in ionosphere = 10^(12)m^(-3) .

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Knowledge Check

  • If the critical frequency for sky wave propagation is 12 MHz , then the maximum electron density in the ionosphere is

    A
    ` 1.78 xx 10^(12) m^(-3) `
    B
    ` 0.178 xx 10^(10) m^(-3)`
    C
    ` 1.12 xx 10^(12) m^(-3)`
    D
    `0.56 xx 10^(12) m^(-3)`

  • A ground receiving station is receiving a signal at 6MHz transmitted from a ground transmitter at a height of 500m located at a distance of 100km. If radius of earth is 6.4xx10^(6) m, maxim um number density of electron in ionosphere is 10^(12)m^(-3) . the signal is coming via:

    A
    ground wave
    B
    spac e wave
    C
    Sky wave propagation is useful in the range of 30 to 40 MHz.
    D
    satellite transponder

  • If critical frequency is 40 MHz then calculate maximum density of electron-

    A
    `20xx10^(12)`
    B
    `20xx10^(14)`
    C
    `20xx10^(10)`
    D
    None of these

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    A ground receiver station is receiving a signal at (a) 5 MHz and 100 MHz , transmitted from a ground transmitter at a height of 400 m located at a distance of 125 km . Identify whether it is coming via space wave or sky wave propagation or statellite transponder. Radius of earth = 6.4 xx 10^(6) m , maximum number density of electrons in ionsphere = 10^(12) m^(-3) .

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    The sky wave propagation is suitable for radiowaves of frequency

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