The wavelength of a spectral line of caesium is $460 \ nm$. What is the frequency of the spectral line?
- A$4.5 \times 10^8 \ Hz$
- B$6.5 \times 10^{14} \ Hz$
- C$3 \times 10^9 \ Hz$
- D$5.6 \times 10^{14} \ Hz$
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