GKFix MCQ Question

What is the frequency of red light with a wavelength of 750 nm?

• A. 3.00 × 10¹⁴ Hz
• B. 3.50 × 10¹⁴ Hz
• C. 4.00 × 10¹⁴ Hz
• D. 4.50 × 10¹⁴ Hz