Exam-style question
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A diagram shows a carrier wave whose amplitude varies in a sinusoidal pattern while its frequency remains constant. Which modulation type is represented?.
- A.Amplitude modulation
- B.Frequency modulation
- C.Phase modulation
- D.Amplitude and frequency modulation
Model answer
What a good answer should say
- Amplitude modulation
Explanation
Why this works
Evidence: the diagram displays amplitude variations with constant frequency. Interpretation: amplitude changes indicate amplitude modulation.
Implication: the modulation type is AM. Conclusion: the correct answer is Amplitude modulation.
Common mistake
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