Mercury street lights emit light of a pale blue color with a wavelength of $436 \, nm$. Calculate its frequency.
- A$6.88 \times 10^{10} \, Hz$
- B$6.88 \times 10^{14} \, Hz$
- C$9.55 \times 10^{17} \, Hz$
- D$4.65 \times 10^{15} \, Hz$
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