A photon has a frequency of 8.63 × 10¹⁴ Hz. What is the energy of this photon in joules?
a) 5.74 × 10⁻¹⁹ J
b) 5.74 × 10⁻²⁰ J
c) 5.74 × 10⁻²¹ J
d) 5.74 × 10⁻²² J