A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?
a) 5.6 × 10¹⁵ Hz
b) 2.6 × 10¹⁵ Hz
c) 4.3 × 10¹⁴ Hz
d) 8.7 × 10¹³ Hz