1. In 1925, Robert Millikan confirmed Hess's findings and subsequently coined the term 'cosmic rays'.

2. The study of characteristics of electric charge for charged dust particles by the Millikan testing method is introduced.

3. Question: In The Millikan Oll-drop Experiment Illustrated In The Figure Below, Anatomizer (a Sprayer With A Fine Norrle) Is Used To Introduce Many Tiny Droplets Of All Between Two Oppositely Charged Parallel Metal Plates