Question : When did Heinrich Hertz discover the photoelectric effect and observe that shining ultraviolet light on the electrodes caused a change in voltage between them?
Option 1: 1916
Option 2: 1902
Option 3: 1990
Option 4: 1887
Correct Answer: 1887
Solution : The correct option is 1887.
In the year 1887, German physicist Heinrich Hertz made a pivotal discovery related to the photoelectric effect while researching radio waves. In the course of his experiments, Hertz utilised a spark gap consisting of two closely spaced, sharp electrodes capable of generating electric sparks to identify the presence of electromagnetic waves.
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