The advantage of an optical fibre is:

  • A
    high bandwidth and $EM$ interference
  • B
    low bandwidth and $EM$ interference
  • C
    high bandwidth,low transmission capacity,and no $EM$ interference
  • D
    high bandwidth,high data transmission capacity,and no $EM$ interference

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$A$ $TV$ tower has a height of $5 \, m$ in a region of population density $\frac{1000}{\pi}$ per square kilometre. The number of people that can receive the transmission is nearly, (in thousands)

$A$ message signal of frequency $f_m$ is used to modulate a carrier of frequency $f_c$. If the sidebands are $f_1$ and $f_2$,then the ratio $\frac{f_c}{f_m}$ is:

The total power content of an $AM$ wave is $1500 \, W$. For $100 \%$ modulation,the power transmitted by the carrier is ........ $W$.

Which of the following statements is $NOT$ correct?

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