Exam-style question
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Which of the following best describes a key advantage of FM over AM in terms of signal quality?.
- A.FM has higher bandwidth, leading to better audio fidelity.
- B.AM is less susceptible to noise.
- C.FM can be transmitted over longer distances without amplification.
- D.AM uses less power for the same signal strength.
Model answer
What a good answer should say
- FM has higher bandwidth, leading to better audio fidelity.
Explanation
Why this works
Define both: AM encodes information by varying the amplitude of a carrier, while FM encodes it by varying the carrier frequency. Identify key difference: FM’s frequency variations are less affected by amplitude noise, giving a higher signal‑to‑noise ratio.
Explain when each applies: AM is simpler but suffers from amplitude‑based interference; FM is used where audio quality matters, such as music broadcasting. Conclude: The advantage of FM in audio fidelity is the higher bandwidth and reduced noise, matching the question.
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