In $1897$,$J$.$J$. Thomson discovered which particle?
- AProton
- BElectron
- CNeutron
- DPositron
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An electron is:
The metal which has the highest work function among the following is:
The minimum value of electric field required to pull out electrons from a metal is approximately . . . . . . $V$/cm.
Which one of the following devices makes use of the electrons to strike certain substances to produce fluorescence?
Easy
View SolutionCathode rays are
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