Discovery charge and mass of electron,proton and neutron
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J. J. Thomson measured the charge-by-mass-ratio (e/m) of cathode ray particle using deflection in both electric and magnetic field.
em=−1.76×108em=−1.76×108 coulomb per gram
The cathode ray particle turned out to be 2000 times lighter than hydrogen.
In 1909, American physicist R. Millikan measured the charge of an electron using negatively charged oil droplets. The measured charge (e) of an electron is −1.60×10−19−1.60×10−19Coulombs.
Using the measured charge of electron, we can calculate the mass of electron from e/m ratio given by J. J. Thomson’s cathode ray experiment.
em=−1.76×108em=−1.76×108 Coulomb-per-gram
m=e−1.76×108m=e−1.76×108
Putting e=−1.60×10−19e=−1.60×10−19 Coulomb,
m=9.1×10−28m=9.1×10−28 gram.
em=−1.76×108em=−1.76×108 coulomb per gram
The cathode ray particle turned out to be 2000 times lighter than hydrogen.
In 1909, American physicist R. Millikan measured the charge of an electron using negatively charged oil droplets. The measured charge (e) of an electron is −1.60×10−19−1.60×10−19Coulombs.
Using the measured charge of electron, we can calculate the mass of electron from e/m ratio given by J. J. Thomson’s cathode ray experiment.
em=−1.76×108em=−1.76×108 Coulomb-per-gram
m=e−1.76×108m=e−1.76×108
Putting e=−1.60×10−19e=−1.60×10−19 Coulomb,
m=9.1×10−28m=9.1×10−28 gram.
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