Exam-style question
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A radio station wants to minimise interference from other stations. Which modulation technique would be preferable, amplitude modulation or frequency modulation, and why?.
Model answer
What a good answer should say
- Frequency modulation would be preferable because it varies the carrier frequency rather than its amplitude, making it less susceptible to amplitude‑based noise and interference.
- Amplitude modulation, which changes the carrier amplitude, is more vulnerable to such disturbances.
- Therefore FM provides clearer reception in noisy environments.
Explanation
Why this works
The answer defines both AM and FM, identifies the key difference (amplitude versus frequency variation), explains the relevance of this difference to interference resistance, and concludes that FM is the better choice. This shows analytical reasoning about how the distinguishing feature affects real‑world performance, thereby assessing the ability to apply the distinction.
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