In which of the following is the remote sensing technique $NOT$ used?

  • A
    Forest density
  • B
    Pollution
  • C
    Wetland mapping
  • D
    Medical treatment

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

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The total power content of an $AM$ wave is $900 \, W$. For $100\%$ modulation,the power transmitted by each sideband is......$W$

The maximum distance between the transmitting and receiving antennas for satisfactory communication in line of sight mode is $57.6 \ km$. If the height of the receiving antenna is $80 \ m$,the height of the transmitting antenna is (Radius of earth $= 6.4 \times 10^6 \ m$) (in $m$)

$A$ message signal of frequency $14 kHz$ is used to modulate a carrier of frequency $900 kHz$. The frequencies of the sidebands are:

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