A Line in the Spectrum of Atomic Mercury Has a Wavelength

Multiple Choice

A line in the spectrum of atomic mercury has a wavelength of 254 nm.When mercury emits a photon of light at this wavelength,the frequency of this light is

A) 8.47 $\times$ 10^-16 s^-1
B) 7.82 $\times$ 10^-19 s^-1
C) 1.18 $\times$ 10¹⁵ s^-1
D) 76.1 s^-1
E) none of these