The specific charge (e/m) of the electron, determined by J. J. Thomson…

Question

The specific charge (e/m) of the electron, determined by J. J. Thomson, is approximately

Accepted Answer

A. 1.76 × 10¹¹ C/kg

1. J. J. Thomson used crossed E and B fields to measure e/m of cathode-ray particles.
2. The accepted value is e/m ≈ 1.76 × 10¹¹ C/kg.
3. e = 1.602 × 10⁻¹⁹ C from Millikan; m = 9.11 × 10⁻³¹ kg follows from these two.
4. This value is universal, independent of cathode material.
_Source: syllabus Physics, Ch 11 "Dual Nature of Radiation and Matter", §11.1_

Answer

1.76 × 10⁷ C/kg

Answer

1.60 × 10⁻¹⁹ C/kg

Answer

9.11 × 10⁻³¹ C/kg

The specific charge (e/m) of the electron, determined by J. J. Thomson, is approximately

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