The particle with highest e/m ratio
Correct answer: A. Electron
- A. Electron
- B. Proton
- C. Neutron
- D. Meson
Explanation
Meson, any member of a family of subatomic particles composed of a quark and an antiquark. Mesons are sensitive to the strong force, the fundamental interaction that binds the components of the nucleus by governing the behaviour of their constituent quarks. It is not related to charge (e or q) Electron has the lowest mass and the charge equal to proton in terms of magnitude. The currently accepted value for e/m is 1.758820 × 1011 C/kg. Neutron has zero charge. Proton has charge equal to electron but mass is much greater than electron. For proton, e/m ratio is 1/1 or 1. The increasing order (lowest to highest) of e/m (charge/mass) ratio is n<p<e.
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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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