Photons and Electrons

[HRS]

Basic quantum question. Not even really at that. Wave mechanics perhaps. But when photons and electromagnetic radiation strike a material and cause the emission of an electron because the radiation is at the proper frequency, would this be an atomic example of resonance frequency? Or even, to an extreme, an example of resonance disaster?

[swansont]

It's not a resonance per se, because emission requires meeting or exceeding a threshold, i.e. the frequency is not at a proper frequency, it is above a minimum frequency. Excitation is an example of a resonance.