The value of the work function of a metal $X$ is $3.1 \ eV$. What is its threshold frequency (in $Hz$)? (Given: $h = 6.62 \times 10^{-34} \ J \cdot s$)
- A$6.49 \times 10^{13}$
- B$5.49 \times 10^{13}$
- C$6.49 \times 10^{14}$
- D$7.49 \times 10^{14}$
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