Extra exam question E7H02

WhyA microphonic is a change in oscillator frequency caused by mechanical vibration. A microphonic is a change in an oscillator's frequency caused by mechanical vibration physically disturbing its components, particularly problematic in crystal oscillators where even tiny mechanical movement can shift the output frequency audibly, answer C. It isn't an IC for amplifying microphone audio, isn't RF pickup distortion on a mic cable, and isn't a description of an oscillator overloading a microphone, those are unrelated phenomena that happen to share the word "microphone" in their description.