What is the modulation index?

What is the modulation index?

Question 1 of 27070JLDOgs6hoXTpPB9yUBJP

What is the modulation index?

Question 1 of 27070

Q

What is the modulation index?

🔍 Key Concepts

• Frequency modulation (FM) basics and how modulation affects a carrier wave • Definition of frequency deviation (how far the carrier frequency moves from its center value) • How a ratio is used to express the depth or extent of modulation

💭 Think About

• Ask yourself: which choice forms a dimensionless ratio (no units) that compares how much the carrier moves to how fast it is being moved? • Think about which terms logically belong in a measure of "how strongly" the carrier is being modulated in frequency terms, not amplitude or pre-emphasis. • Consider common textbook phrases like "modulation index in FM is defined as..." and match that structure to the options.

✅ Before You Answer

• Verify which option uses maximum frequency deviation in the numerator, since that is central to FM modulation depth. • Check which option uses modulating (audio) frequency, not carrier frequency, in defining how intense the modulation is. • Eliminate any option that introduces pre-emphasis or terms that are not part of the standard FM modulation index definition.