What is the frequency of monochromatic light where the photon energy is 4.3 × 10⁻¹⁹ J? (h = 6.63 × 10⁻³⁴ J·s)
A) 4.3 × 10¹⁵ Hz
B) 2.1 × 10¹⁵ Hz
C) 6.5 × 10¹⁴ Hz
D) 1.9 × 10¹⁴ Hz
E) 6.5 × 10¹³ Hz