If wavelength of a wave is $\mathrm{\lambda }=6000\mathrm{\AA }.$ Then wave number will be 

• A

  $166\times {10}^3{\mathrm{m}}^{-1}$

• B

  $16.6\times {10}^{-1}{\mathrm{m}}^{-1}$

• C

  $1.66\times {10}^6{\mathrm{m}}^{-1}$

• D

  $1.66\times {10}^7{\mathrm{m}}^{-1}$