How do i convert Energy (joules) into frequency (Hz)?

To convert energy in joules to frequency in hertz, you can use the Planck-Einstein relation, E = hf, where E is the energy in joules, h is the Planck constant (6.626 x 10^-34 Js), and f is the frequency in hertz. Rearrange the equation to solve for frequency: f = E / h. Simply divide the energy in joules by the Planck constant to calculate the frequency in hertz.