Exam-style question
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Explain why modulation is used when transmitting information signals over radio waves.
Model answer
What a good answer should say
- Modulation shifts a low‑frequency information signal onto a higher‑frequency carrier wave.
- This allows the signal to be transmitted efficiently over the radio spectrum, to be amplified and filtered, and to reduce interference with other signals.
Explanation
Why this works
The answer correctly identifies the key functions of modulation: frequency shifting, efficient spectrum use, amplification, filtering, and interference reduction. It demonstrates a clear understanding of why modulation is necessary in radio communication.
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