terminal velocity of gravity fall (measure by timing drop) vg: terminal velocity of rise (depends on q: measure series of vE: vE) experiment with many different charges on drop set of values for , vE q all integer multiples of one value = 1.6 x 10-19 C qe mass of the electron 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
vg: terminal velocity of gravity fall (measure by timing drop) vE: terminal velocity of rise (depends on q: measure series of vE) experiment with many different charges on drop set of values for vE , q all integer multiples of one value qe = 1.6 x 10-19 C mass of the electron 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
fintroduction-to-particle-physics2.docx