AP EAMCET · PHYSICS · Communication System
In amplitude modulation, if a message signal of 5 kHz is modulated by a carrier wave of frequency 900 kHz, then the frequencies of the side bands are
- A \(905 \mathrm{kHz}, 895 \mathrm{kHz}\)
- B \(900 \mathrm{kHz}, 800 \mathrm{kHz}\)
- C \(800 \mathrm{kHz}, 700 \mathrm{kHz}\)
- D \(1000 \mathrm{kHz}, 900 \mathrm{kHz}\)
Answer & Solution
Correct Answer
(A) \(905 \mathrm{kHz}, 895 \mathrm{kHz}\)
Step-by-step Solution
Detailed explanation
\(f_{USB} = f_c + f_m\) \(f_{USB} = 900\, \mathrm{kHz} + 5\, \mathrm{kHz} = 905\, \mathrm{kHz}\) \(f_{LSB} = f_c - f_m\) \(f_{LSB} = 900\, \mathrm{kHz} - 5\, \mathrm{kHz} = 895\, \mathrm{kHz}\) \(905\, \mathrm{kHz}, 895\, \mathrm{kHz}\)
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