Mass of electron in a.m.u is:
Correct answer: C. 5.485 x 10^-4
- A. 1.0073
- B. 1.0087
- C. 5.485 x 10^-4
- D. 9.1 x 10^-31
Explanation
The conversion from kg to a.m.u is; 1 a.m.u= 1.66 x 10-27 The mass of an electron is 9.11x10-31 kg; this value should be learned for the exam. Converting it to a.m.u will be done by dividing 9.11 x 10-31 kg by 1.66 x 10-27 kg/a.m.u which would give us 5.48 x 10-4 a.m.u. Options A and B are the mass, in a.m.u, for a proton and a neutron, respectively. Option D is the mass, in kg, for an electron.
This question appeared on the NUMS 2020 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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