$AM$ is used for broadcasting because...

  • A
    It reduces bandwidth.
  • B
    It allows transmission for different users.
  • C
    It is not affected by transmitter noise.
  • D
    Other conditions do not provide the required bandwidth.

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Coaxial cable,a widely used wire medium,offers an approximate frequency bandwidth of:

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An antenna is placed in a dielectric medium of dielectric constant $6.25$. If the maximum size of the antenna is $5.0 \, mm$,what is the minimum frequency of the signal it can radiate in $GHz$? (Given $\mu_{r} = 1$ for the dielectric medium)

$A$ carrier wave of amplitude $15\,V$ is modulated by a sinusoidal baseband signal of amplitude $3\,V$. The ratio of maximum amplitude to minimum amplitude in an amplitude modulated wave is:

$A$ wave is represented as $e = 10\,(1 + 6\, \sin(50t)) \sin(10^8t)$. The modulation index is:

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