GKFix MCQ Question

What is the threshold frequency of a metal with work function 2.16 eV?

• A. 3.89 × 10¹⁴ Hz
• B. 4.31 × 10¹⁴ Hz
• C. 4.73 × 10¹⁴ Hz
• D. 5.15 × 10¹⁴ Hz