Describe the experiment which led to the discovery of the proton.

Answer

Production of Anode rays (Discovery of proton). Goldstein `(1886)` performed the experiment with a discharge tube filled with a perforated cathode and found that new type of rays came out through the hole in the cathode.
When this experiment is conducted, a faint red glow is observed on the wall behind the cathode. Since these rays originate from the anode, they are called anode rays.
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