The work function of calcium is 2.14 eV. Find the threshold frequency for calcium.

$5.16 × 10^{12} Hz$ $5.16 × 10^{13} Hz$ $5.16 × 10^{14} Hz$ $5.16 × 10^{15} Hz$

$5.16 × 10^{14} Hz$

The correct answer is Option (3) → $5.16 × 10^{14} Hz$