The frequency of a light wave is $12 \times 10^{14} \ s^{-1}$. The wave number associated with it is .......

• A
  $5 \times 10^{-7} \ m$
• B
  $4 \times 10^{-8} \ cm^{-1}$
• C
  $2 \times 10^{-7} \ m^{-1}$
• D
  $4 \times 10^4 \ cm^{-1}$