The Wavelength of the Yellow Light Given Off by a Sodium

Multiple Choice

The wavelength of the yellow light given off by a sodium vapor street lamp is 589 nm.What is the frequency of this light in hertz (s^-1) ?

A) 5.09 x 10⁵ s^-1
B) 5.09 x 10¹⁴ s^-1
C) 1.96 x 10^-6 s^-1
D) 1.96 x 10^-13 s^-1
E) 1.77 x 10² s^-1