Function photon_energy_from_frequency 

pub fn photon_energy_from_frequency(frequency: f64) -> Option<f64>

Computes photon energy from frequency using E = h * f.

Returns None when frequency is negative, when the input is not finite, or when the computed result is not finite.

Examples

use use_quantum::{PLANCK_CONSTANT, photon_energy_from_frequency};

let energy = photon_energy_from_frequency(1.0).ok_or("expected valid frequency")?;

assert_eq!(energy, PLANCK_CONSTANT);