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What is the frequency of monochromatic light where the photon energy is 4.3 × 10⁻¹⁹ J? (h = 6.63 × 10⁻³⁴ J·s) A) 4.3 × 10¹⁵ Hz B) 2.1 × 10¹⁵ Hz C) 6.5 × 10¹⁴ Hz D) 1.9 × 10¹⁴ Hz E) 6.5 × 10¹³ Hz
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