Visible light travels at a speed 3.0 × 108 of m/s. If red light has a wavelength of 6.5 × 10–7 m, what the frequency of this light?

Use the wave relationship speed = wavelength × frequency, so frequency = speed ÷ wavelength. Substituting the values gives (3.0 × 10⁸ m/s) ÷ (6.5 × 10⁻⁷ m) ≈ 4.6 × 10¹⁴ s⁻¹, or Hz. Therefore, the correct choice is 4.6 × 10¹⁴ Hz.

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