Question

At 100% modulation, let the total power in the sidebands be x% of the total power of the amplitude modulated wave. Here, ‘x’ is equal to,

(1) 25

(2) 33.3

(3) 75

(4) 100

Answer 1

(2) 33.3

Fraction of total power carried by the sidebands = m²/2+m²

Therefore, at 100% modulation, sidebands carry only 1/3rd of the total power.