In _____, Goldstein discovered the existence of positively charged rays in the discharge tube by using perforated cathode.

1886

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1885

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1884

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1881

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Solution

The correct option is B $1886$
In 1886, Goldstein discovered the existence of positively charged rays in the discharge tube by using perforated cathode.
These rays were named as anode rays or canal rays. In 1899, Rutherford discovered alpha and beta 'rays' from uranium. He later demonstrated that alpha rays are the nuclei of helium atoms.

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