90. (a) The graph shows part of a periodic pattern of half-cycle “length” ∆ n = 0.4. Thus if we set n = 1.0 + 2 ∆ n = 1.8 then the maximum at n = 1.0 should repeat itself there. (b) Continuing the reasoning of part (a), adding another half-cycle “length” we get 1.8 2.2 n +∆ = for the answer.
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