What was Robert Millikan experiment for the atomic theory?
Robert Millikan’s oil-drop experiment. By comparing applied electric force with changes in the motion of the oil drops, he was able to determine the electric charge on each drop. He found that all of the drops had charges that were simple multiples of a single number, the fundamental charge of the electron.
Who is Robert Millikan and what did he discover?
Robert Millikan was a physicist who discovered the elementary charge of an electron using the oil-drop experiment.
Why was Millikan experiment important?
Millikan’s experiment is important because it established the charge on an electron. Millikan used a very simple a very simple apparatus in which he balanced the actions of gravitational, electric, and (air) drag forces. Using this apparatus, he was able to calculate that the charge on an electron was 1.60 × 10⁻¹⁹ C.
What did Robert Millikan discover about the electron quizlet?
What did Robert Millikan discover about the electron? The charge and the mass of the electron. The charge on each drop was always some multiple of a single very small value, which he proposed to be the fundamental unit of charge carried by each e-.
How did Millikan prove Einstein’s theory?
While it had been known for a long time that light falling on metal surfaces may eject electrons from them (the photoelectric effect), Millikan was the first to determine with great accuracy that the maximum kinetic energy of the ejected electrons obey the equation Einstein had proposed in 1905: namely, 1/2mv2=hf-P.
What did Robert Millikan conclude from his oil drop experiment?
Millikan was able to measure both the amount of electric force and magnitude of electric field on the tiny charge of an isolated oil droplet and from the data determine the magnitude of the charge itself.
What did Rutherford discover about the atomic nucleus?
What did Ernest Rutherford discover about the atom? Ernest Rutherford found that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. The nucleus is positively charged and surrounded at a great distance by the negatively charged electrons.
What did Rutherford discover about the atomic nucleus quizlet?
What did Rutherford discover about the atomic nucleus? The mass of the atom is concentrated in a positively charged core. The high-density core of an atom is extremely small compared to the size of the atom.
When did Robert Millikan discover the mass of an electron?
In 1910 Robert Millikan succeeded in precisely determining the magnitude of the electron’s charge. Small electrically charged drops of oil were suspended between two metal plates where they were subjected to the downward force of gravity and the upward attraction of an electrical field.
What was Millikan wrong about?
Millikan’s reported value for the elementary charge, 1.592 x 10-19 coulombs, is slightly lower than the currently accepted value of 1.602 x 10-19 C, probably because Millikan used an incorrect value for the viscosity of air.
What did Rutherford discover?
Rutherford at Manchester, 1907–1919. Ernest Rutherford discovered the nucleus of the atom in 1911.