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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