The Frequency of a Photon of Electromagnetic Radiation with an Energy

The frequency of a photon of electromagnetic radiation with an energy of 7.3×10 ^{- 18} J is

A) 2.7×10 ^{- 8} s ^{- 1}
B) 9.9×10¹⁹ s ^{- 1}
C) 2.0×10¹⁶ s ^{- 1}
D) 1.1×10¹⁶ s ^{- 1}
E) none of these