Mass spectroscopy mainly tells about ____________?
Correct answer: B. e/m ratio
- A. Mass
- B. e/m ratio
- C. Isotopes
- D. None of These
Explanation
A mass spectrometer separates ions according to their mass-to-charge ratio, m/z, by combining electric and magnetic fields. Therefore its primary measurement is the mass-to-charge ratio, represented here by e/m in option b, although it can also help identify isotopes. Option a is the likely mistake because the instrument does not directly measure mass alone when ions have different charges.
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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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