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railway-question-paper-NTPC-2017-->View question

Who discovered electron?

  1. Ernest Rutherford
  2. Neils Bohr
  3. J. J. Thomson
  4. Albert Einstein


Asked On2019-06-14 15:38:32 by:amitoj-singh

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C.)J. J. Thomson
J. J. Thomson constructed a glass tube which was partially evacuated i.e. much of the air was pumped out of the tube. Then he applied a high electrical voltage between two electrodes at either end of the tube. He detected that a stream of particle (ray) was coming out from the negatively charged electrode (cathode) to positively charged electrode (anode). This ray is called cathode ray and the whole construction is called cathode ray tube.
J. J. Thomson measured the charge-by-mass-ratio (e/m) of cathode ray particle using deflection in both electric and magnetic field.

em=1.76×108 coulomb per gram

The cathode ray particle turned out to be 2000 times lighter than hydrogen.

Although we got e/m ratio for electron from J.J. Thomson’s Cathode Ray Tube experiment, we still don’t know the exact charge (e) for electron. American physicist Robert Millikan designed an experiment to measure the absolute value of the charge of electron which is discussed below.

 


Answerd on:2019-06-27 Answerd By:KAPILJHADE

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Answer : J J Thomson
Explanation :
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
J. J. Thomson constructed a glass tube which was partially evacuated i.e. much of the air was pumped out of the tube. 
Then he applied a high electrical voltage between two electrodes at either end of the tube.
He detected that a stream of particle (ray) was coming out from the negatively charged electrode (cathode) to positively charged electrode (anode). 
This ray is called cathode ray and the whole construction is called cathode ray tube. 

Answerd on:2019-06-18 Answerd By:pavanmacherla

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