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Equation of a waves: V = 10 sin (10^(6) ...

Equation of a waves: V = 10 sin `(10^(6) t + 0.4 sin 1000 t)`.
What is its index of modulation?

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The given wave is a frequency modulated wave.
General equation of the wave, `V = V_(0) sin (Omegat + beta sin omega t )`
Comparing this with the given equation we get, modulation index, `beta` = 0.4
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