GKFix MCQ Question

What is the wavenumber of a wave with a wavelength of 200 nm?

• A. 2.5 × 10⁴ cm⁻¹
• B. 3.0 × 10⁴ cm⁻¹
• C. 4.0 × 10⁴ cm⁻¹
• D. 5.0 × 10⁴ cm⁻¹