Q 12-08-231JEE MainJEE Main 2018 (8 Apr)Easy
A telephonic communication service is working at a carrier frequency of $10$ GHz. Only $10\%$ of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of $5$ kHz?
Answer: (D) $2\times10^5$
Available bandwidth $= 10\%$ of $10$ GHz $= 10^9$ Hz.
$$N = \frac{10^9}{5\times10^3} = 2\times10^5$$
Solution by Sreeraj P, M.Sc Physics