The threshold frequency of a metal with work function $6.63 \mathrm{~eV}$ is :

Question

$16 \times 10^{15} \mathrm{~Hz}$

$16 \times 10^{12} \mathrm{~Hz}$

$1.6 \times 10^{15} \mathrm{~Hz}$

$1.6 \times 10^{12} \mathrm{~Hz}$

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