hertz and lenard's observations in photoelectric effect

Hertz and lenard's observations in photoelectric effect are as follows.
1.Hertz observed the photoelectric effect and the production and reception of electromagnetic waves.
2.Lenard observed that if light frequency varies then electron energy also varies, using a powerful electric arc lamp which enabled him to investigate large changes in intensity, and that had sufficient power to enable him to investigate the variation of potential with light frequency.

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