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On a dry day, your body can accumulate static charge from walking across a carpet or from brushing your hair. If your body develops a charge of -22 mC (microcoulombs), what is their collective mass?
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2. Atoms & Elements
Millikan Oil Drop Experiment
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Which scientist is most closely associated with the discovery of the electron?
A
Ernest Rutherford
B
Niels Bohr
C
J.J. Thomson
D
Robert Millikan
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Understand that the question is about identifying the scientist who discovered the electron, a fundamental subatomic particle.
Recall that J.J. Thomson is credited with the discovery of the electron in 1897 through his experiments with cathode rays.
Note that Ernest Rutherford is known for discovering the nucleus and proposing the nuclear model of the atom.
Recognize that Niels Bohr developed the Bohr model of the atom, explaining electron orbits but did not discover the electron itself.
Remember that Robert Millikan measured the charge of the electron through his oil drop experiment but did not discover the electron.
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