JEE Main 2016 Physics question
Not in JEE or NEET syllabus
A modulated signal has the form . The carrier frequency the modulating frequency (message frequency) and the modulation index are respectively given by :
Answer: (2)
Solution
Collapse the bracketed difference of cosines using :
200π t - 400π t = 2300π t 100π t.
The whole signal becomes
= 30300π t + 20300π t100π t = 30[1+23100π
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