alleryStart learning →Thomson determined which quantity for the electron?
AIts nuclear binding energy
BIts charge-to-mass ratio
CIts absolute charge alone
DIts absolute mass alone
Answer & Solution
Correct answer: B. Its charge-to-mass ratio
1. Thomson's cathode ray tube deflected the beam in electric and magnetic fields.
2. That experiment cannot separate charge from mass on its own.
3. The charge-to-mass ratio was known due to Thomson's research, at 1.759 times ten to the eleventh coulombs per kilogram.
4. Millikan later supplied the charge, and combining the two gave the mass.
5. Nuclear binding energy belongs to a much later era of physics.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 2 'Atoms, Molecules, and Ions', sections 2.1-2.6_
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