Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

A diode AM detector with the output circuit consisting of R = 1kΩ and C = 1 µF would be more suitable for detecting a carrier signal of

  • 0.1 kHz

  • 0.5 kHz

  • 10 kHz

  • 0.75 kHz


C.

10 kHz

Given,   R = 1 kΩ

or         R = 1 × 103

            C = 1 µF

or         C = 1 × 10-6 F

In this condition frequency of carrier signal

                    1RC << fC11 × 103 × 10-6 << fC                      fC >> 1 kHz

Because frequency is greater than 1.

So,     fC = 10 kHz


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72.

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

  • 2 million

  • 10 million

  • 0.1 million

  • 1 million


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