Exam-style question
Try this first
Which statement best describes the difference between amplitude modulation (AM) and frequency modulation (FM) signals?.
- A.AM varies the amplitude of the carrier while FM varies its frequency
- B.AM varies the frequency of the carrier while FM varies its amplitude
- C.Both AM and FM vary the amplitude and frequency of the carrier
- D.AM varies the phase of the carrier while FM varies its amplitude
Model answer
What a good answer should say
- AM varies the amplitude of the carrier while FM varies its frequency
Explanation
Why this works
Define both: AM changes the carrier’s amplitude to encode information; FM changes the carrier’s frequency. Identify key difference: AM alters amplitude, FM alters frequency.
Explain when each applies: AM is used where simple modulation is needed; FM is used where noise immunity is important. Conclude: The correct statement is that AM varies amplitude and FM varies frequency.
Common mistake
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