Modulation index in Amplitude Modulation

A modulation index of 0.5 would be same as

a) 0.5 of Modulation Depth
b) 1/2% of Modulation Depth
c) 5% of Modulation Depth
d) 50% of Modulation Depth

Correct Answer: d) 50% of Modulation Depth


Modulation depth is typically the modulation index expressed as a percentage of the figure. Thus a modulation index of 0.5 is expressed as a modulation depth of 50%. However, often the two terms and figures may be used interchangeably. For a modulation index of 1.0, it means 100% modulation, i.e., the carrier level falls to zero level and rises to twice of its un modulated level.
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