Advanced Placement (AP)

As the night progresses, the amplitude of a sleeper's brainwaves _____, and the frequency of the waves _____. a. increases; decreases b. decreases; increases c. increases; increases d. decreases; decreases

(1) Answers

I think the correct answer would be D. The brain waves changes from stage 1 to stage 2 as a person sleeps in a way that these waves become slower. That is, the amplitude would  decrease since less activity is done and the frequency would decrease as well since less wave passes per second.

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