The Energy of a Photon That Has a Frequency of 18.21

Multiple Choice

The energy of a photon that has a frequency of 18.21 × 10¹⁵ s^{- 1} is _ _ J.

A) 3.49 × 10^{- 48}
B) 1.99 × 10^{- 25}
C) 5.44 × 10^{- 18}
D) 1.21 × 10^{- 17}
E) 5.44 × 10^{- 18}.