Here we pass 115 volts of electricity through a pickle and observe the glow. When electrons get excited they jump to an outer energy level. When the electron falls back it emits a particular frequency of light. This light emitted by the pickle is a signature of the element sodium. Because pickles contain lots of sodium and the pickle conducts electricity we get to see the characteristic yellow light. Hold a spectroscope up to this and you will get the emission spectra for sodium. Danger, high voltage!
