The constancy of the e/m ratio of electrons shows that:
Correct answer: B. Electron are universal particles of all matter
- A. Electron mass is 1/87th of proton
- B. Electron are universal particles of all matter
- C. Electrons are produced in discharge
- D. None of the above
Explanation
The constancy of the e/m ratio for electrons despite variations in the gas present in the discharge tube or in the material of the cathode shows that electrons are universal constituent particles. Electrons are present in all elements in their standard state, and the individual properties of electrons are the same for every element.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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