The frequency of a photon is 7.5 × 10¹⁴ Hz. What is its energy in joules? (h = 6.626 × 10⁻³⁴ J s)
E = hν = 4.9695×10⁻¹⁹ J.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability