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In optical communication system operatin...

In optical communication system operating at 1200nm, only 2% of the source frequency is available for TV transmission having a bandwidth of 5MHz. The number of TV channels that can be transmitted be

A

2 million

B

10 million

C

0.1 million

D

1 million

Text Solution

Verified by Experts

The correct Answer is:
D
The frequency for optical communication
`v=c/lamda`
or `v=(3 times 10^8)/(1200 times 10^-9)`
`v=25 times 10^13 Hz`
But only 2% of the source frequency is available for TV transmission.
`therefore v.=2.5 times 10^14 times 2%`
or `v.= 2.5 times 10^14 times 2/100`
or `v.=5 times 10^12 Hz`
`therefore` Number of channels =`(v.)/(bandwidth)`
or number of channels =`(5 times 10^12)/(5mHz)`
or number of channels =`(5 times 10^12)/(5 times 10^6)`
`=10^6`
1 million
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