An AM wave is given byeAM = 10(1 + 0·4 cos 103t + 0·3

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An AM wave is given by
e_AM = 10(1 + 0·4 cos 10³t + 0·3 cos 10⁴t) cos 10⁶t
The modulation index is—

1. 0.4
2. 0.5
3. 0.3
4. 0.9

Correct Option: B

Try yourself.