GKFix MCQ Question

What is the frequency of a wave with a wavelength of 400 nm?

• A. 5.0 × 10¹⁴ Hz
• B. 6.0 × 10¹⁴ Hz
• C. 7.5 × 10¹⁴ Hz
• D. 8.0 × 10¹⁴ Hz