William Crookes named the invisible rays emitted from cathode as ________.

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Solution

In 1878, William Crookes discovered electrons while studying electric discharge through the gases in the discharge tube experiment.
When he passed an electric current of high voltage through a discharge tube containing air at low pressure.
He observed a greenish-yellow light at the opposite end of the cathode.
The invisible rays were emitted from the cathode, he called these rays cathode rays.
Hence, William Crookes named the invisible rays emitted from the cathode as cathode rays.

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