since = 1.76 x 1011 C/kg (Thomson) q/me and = 1.6 x 10-19 C qe (Millikan) deduce = 9.1 x 10-31 C/kg me 2.Canal rays and the proton Thomson (~1890): does anode produce +ve rays? +ve rays detected when slit put in cathode measure ratio of +ve rays using Thomson method q/m Results much smaller than electron case vx much smaller than electron case q/m depends on gas in tube q/m largest value for hydrogen q/m other gases have simple fractions of H value q/m Deduce +ve particles (ions) due to collision with gas atoms e charge equal and opposite to electron mass much larger than electron (from q/m) H ion is lightest (named proton)
since q/me = 1.76 x 1011 C/kg (Thomson) and qe = 1.6 x 10-19 C (Millikan) deduce me = 9.1 x 10-31 C/kg 2.Canal rays and the proton Thomson (~1890): does anode produce +ve rays? +ve rays detected when slit put in cathode measure q/m ratio of +ve rays using Thomson method Results vx much smaller than electron case q/m much smaller than electron case q/m depends on gas in tube largest q/m value for hydrogen other gases have q/m simple fractions of H value Deduce +ve particles (ions) due to e collision with gas atoms charge equal and opposite to electron mass much larger than electron (from q/m) H ion is lightest (named proton)
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