In another experiment, the lengths of sparks generated by an induction coil were found to have become smaller in darkness.
It is employed by the new titanium based toothbrush called soladey, which combat plaque by neutralizing the substance's protons.  In one experiment involving it, a circular zinc plate is attached to a gold leaf electroscope exposed to burning magnesium.  In another experiment, the lengths of sparks generated by an induction coil were found to have become smaller in darkness. In addition to the work of Wilhelm Hallwachs and Heinrich Hertz, it is demonstrated in experiments where no detectable time lag is found, and kinetic energy is seen to be independent of intensity.  The cut-off frequency times Planck's constant is used to calculate the minimum energy needed for an electron to escape the surface, the work function.  FTP, name this phenomenon where electrons are emitted from matter after the absorption of packets of electromagnetic radiation, famously explained by Albert Einstein.
It is employed by the new titanium based toothbrush called soladey, which combat plaque by neutralizing the substance's protons.  
{photoelectric} effect