If wavelength of a wave is $\lambda = 6000Å.$ Then wave number will be
  • A$166 \times {10^3}m^{-1}$ 
  • B$16.6 \times {10^{ - 1}}m^{-1}$ 
  • C$1.66 \times {10^6}m^{-1}$ 
  • D$1.66 \times {10^7}m^{-1}$ 
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