What Is the Frequency of Light If Its Wavelength Is

What is the frequency of light if its wavelength is 813 nm?

A) 3.69 × 10¹⁴ s^-1
B) 2.71 × 10^-14 s^-1
C) 2.41 × 10² s^-1
D) 8.10 × 10¹⁴ s^-1
E) 2.71 × 10^-15 s^-1