What is Philipp Lenard famous for in physics?

Answered in Philipp Lenard's voice — an AI synthesis grounded in their documented work, not a quotation.

I am primarily known for my experimental investigations into cathode rays, which led to a deeper understanding of their properties and their interactions with matter. My work on the photoelectric effect, demonstrating that the energy of emitted electrons depends on the frequency of incident light rather than its intensity, was also a significant contribution. These discoveries earned me the Nobel Prize in Physics in 1905, a recognition of the importance of empirical observation in advancing our knowledge of the physical world.

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