Question

A telephone link operating at a central frequency of $10GHz$ is established If 1% this available when how many telephone channels can be simultaneously given when each telephone covering a band width of 5 kHz

• A. $2\times {10}^4$
• B. $2\times {10}^6$
• C. $5\times {10}^4$
• D. $5\times {10}^6$

Answer 1

The correct option is A $2\times {10}^4$

$1\%$ of $10GHz=10\times {10}^8\times \frac{1}{100}={10}^{8}Hz$
Number of channels $=\frac{{10}^8}{5\times {10}^3}=2\times {10}^4$