What did Robert Millikan contribute to the atomic theory?
What did Robert Millikan contribute to the atomic theory?
Robert Millikan was an American, Nobel Prize-winning physicist, credited with the discovering the value for electron charge, e, through the famous oil drop experiment, as well as achievements related to the photoelectric effect and cosmic radiation.
Why was Millikan discovery 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 atomic model did Millikan use?
In 1904, he proposed the plum pudding model, in which the electrons were immersed in a positively charged “pudding”. In 1909, Millikan performed his famous oil drop experiment and determined the charge ( e ) of the electron.
What did Ernest Rutherford contribute to the atomic theory?
Ernest Rutherford is known for his pioneering studies of radioactivity and the atom. He discovered that there are two types of radiation, alpha and beta particles, coming from uranium. He found that the atom consists mostly of empty space, with its mass concentrated in a central positively charged nucleus.
When did Henry Moseley contribute to the atomic theory?
Henry Moseley was an outstandingly skilled experimental physicist. In 1913 he used self-built equipment to prove that every element’s identity is uniquely determined by the number of protons it has.
What did Marie Curie contribute to the atomic theory?
Radioactivity, Polonium and Radium Curie conducted her own experiments on uranium rays and discovered that they remained constant, no matter the condition or form of the uranium. The rays, she theorized, came from the element’s atomic structure. This revolutionary idea created the field of atomic physics.
What contribution did Robert Millikan make in the study of atomic structure discuss how he came up with his result?
Robert Millikan’s accomplishments were the design and fine-tuning of experiments which unambiguously confirmed the most important scientific theories of his time, providing the implications for atomic theory. His oil drop experiment confirmed the existence of the electron and accurately determined its charge.
Who is Robert Millikan and what did he discover?
March 22, 1868 – December 19, 1953 Robert Millikan was a physicist who discovered the elementary charge of an electron using the oil-drop experiment.
How did Schrodinger contribute to the atomic theory?
Assuming that matter (e.g., electrons) could be regarded as both particles and waves, in 1926 Erwin Schrödinger formulated a wave equation that accurately calculated the energy levels of electrons in atoms.
What did Henry Moseley discover about the atomic theory?
In 1913 he used self-built equipment to prove that every element’s identity is uniquely determined by the number of protons it has. His discovery revealed the true basis of the periodic table and enabled Moseley to predict confidently the existence of four new chemical elements, all of which were found.
What did Millikan oil drop experiment show?
The oil drop experiment was performed by Robert A. Millikan and Harvey Fletcher in 1909 to measure the elementary electric charge (the charge of the electron). The experiment entailed observing tiny electrically charged droplets of oil located between two parallel metal surfaces, forming the plates of a capacitor.
What did Robert Millikan discover about the electron?
Robert Millikan made numerous discoveries in the fields of optics, electricity and physics. One of his most important discoveries was the determination of the charge of an electron. His calculations were instrumental in proving that electrons are fundamental, or indivisible, particles.
What is Robert Millikan known for?
Robert A. Millikan Biography. Educator, Physicist, Scientist (1868–1953) American physicist Robert A. Milikan is best known for measuring the charge on the electron, for which he won the Nobel Prize in Physics in 1923.
What did Robert Millikan do?
Robert Millikan. Written By: Robert Millikan, in full Robert Andrews Millikan, (born March 22, 1868, Morrison, Illinois, U.S.—died December 19, 1953, San Marino , California), American physicist honoured with the Nobel Prize for Physics in 1923 for his study of the elementary electronic charge and the photoelectric effect.
