Exam-style question
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Which limitation is common to AM but not to FM?.
- A.AM signals are more prone to atmospheric noise.
- B.FM signals require more complex receivers.
- C.AM cannot be used for radio broadcasting.
- D.FM signals have lower power consumption.
Model answer
What a good answer should say
- AM signals are more prone to atmospheric noise.
Explanation
Why this works
Define both: AM transmits by amplitude changes, FM by frequency changes. Identify key difference: AM’s amplitude is directly affected by external noise, whereas FM’s frequency is largely immune.
Explain when each applies: In environments with high electrical interference, AM suffers more; FM remains robust. Conclude: The common limitation of AM is its susceptibility to atmospheric noise, which FM avoids.
Common mistake
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