What Is the Wavelength of Light with a Frequency of 8.2×10¹³

What is the wavelength of light with a frequency of 8.2×10¹³ s ^{- 1}?

A) 2.8×10 ^{- 5} m
B) 7.2×10 ^{- 7} m
C) 4.8×10 ^{- 7} m
D) 3.7×10 ^{- 6} m
E) none of these