Find energy of each of the photons which correspond to light of frequency $3× 10^{15}\; Hz.$

Question

$\begin{array}{1 1}(a)\;1.988 \times 10^{-18}\; KJ \\ (b)\;1.988 \times 10^{–18} \;J \\ (c)\;1.988 \times 10^{–10}\; J \\ (d)\;2.988 \times 10^{–18}\; J \end{array}$