Class 12

32. Communication System question bank (Physics)

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Q1.

Consider an optical communication system operating at $800 \, nm$. Suppose,only $1\%$ of the optical source frequency is the available channel bandwidth for optical communication. How many channels can be accommodated for transmitting audio signals requiring a bandwidth of $8 \, kHz$?

(A)
$4.8 \times 10^{8}$
(B)
$48$
(C)
$6.2 \times 10^{8}$
(D)
$4.8 \times 10^{5}$
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Q2.

An amplitude modulated wave is modulated to $50\%$. What is the saving in power if the carrier as well as one of the sidebands are suppressed?

(A)
$70$
(B)
$65.4$
(C)
$94.4$
(D)
$25.5$
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