Ionization energy of gaseous $Na$ atoms is $495.5 \ kJ \ mol^{-1}$. The lowest possible frequency of light that ionizes a sodium atom is $(h = 6.626 \times 10^{-34} \ J \ s, N_A = 6.022 \times 10^{23} \ mol^{-1})$.
- A$7.50 \times 10^4 \ s^{-1}$
- B$4.76 \times 10^{14} \ s^{-1}$
- C$3.15 \times 10^{15} \ s^{-1}$
- D$1.24 \times 10^{15} \ s^{-1}$
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