Pick out electron’s charge to mass ratio’s value from the options.(a) 1.758820 × 10^11 C kg^-1(b) 1.758820 × 10^11 C kg(c) 1.758823 × 10^11 C kg(d) 1.708820 × 10^11 C kgI have been asked this question in a national level competition.Query is from Discovery of Sub-atomic Particles in division Structure of Atom of Chemistry – Class 11

Pick out electron’s charge to mass ratio’s value from the options.

1.	Pick out electron’s charge to mass ratio’s value from the options.(a) 1.758820 × 10^11 C kg^-1(b) 1.758820 × 10^11 C kg(c) 1.758823 × 10^11 C kg(d) 1.708820 × 10^11 C kgI have been asked this question in a national level competition.Query is from Discovery of Sub-atomic Particles in division Structure of Atom of Chemistry – Class 11
Answer» Right choice is (a) 1.758820 × 10^11 C kg^-1 Easy explanation: A British physicist J. J. Thomson carried out experiments and observed the DEFLECTIONS made by ELECTRONS in an electric or magnetic field. He finally CALCULATED ELECTRON’s charge to mass ratio as e/me = 1.758820 × 10^11 C kg^-1. The units of charge and mass are in coulomb and kg respectively.

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