9. Which of the following frequencies corresponds to light with the longest wavelength?
(A) 3.00 × 1013 s–1
(B) 4.12 × 105 s–1
(C) 8.50 × 1020 s–1
(D) 9.12 × 1012 s–1
(E) 3.20 × 109 s–1

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