History of Quantum Scientists Worksheet Key

Name:______KEY______Date:______Period:_____

Directions Write the name of the scientist along with the major accomplishment he is associated with next to the corresponding date in the timeline on the next page. Each choice is used only once and there are a few scientists not used at all.

Robert Millikan 1897 – First credited with the inclusion of the “corpuscle”. 1925 – First to assert that no electron can have the same set of quantum Max Planck numbers at the same instant in time. James Van Allen 1911 – First to propose a planetary model of the atom with a nucleus at Louis Debroglie the center and electrons in orbits around it. 1900 – First to propose that there is a minimum size or quanta in which J.J. Balmer atoms can release or absorb energy. Ernest Rutherford 1926 – First to provide both the wave and particle properties of the Niels Bohr electron in one equation. 1913 – First model that restricts an electron to specific energy levels. Arthur Compton 1924 – First to propose that an orbiting electron has a particular James Chadwick wavelength associated with it. Albert Einstein 1927 – First to assert that it is impossible to know both the exact momentum of an electron and its exact location in space at the same Wolfgang Pauli time. Werner Heisenberg 1904 – First to propose a “Saturnian” model of the atom. James Kirk 1905 – First successful explanation of the photoelectric effect. 1932 – First to prove the existence of the neutron. James Maxwell 1885 – First described the emission spectrum of hydrogen. J.J. Thomson 1923 – First to accurately describe the scattering of x-rays. Erwin Schrodinger 1909 – First successful measurement of the elementary charge of an electron. Hantaro Nagaoka

------History of Physics Review Timeline------

1885 J.J. Balmer First described the emission spectrum of hydrogen.

1897 J.J. Thomson First credited with the inclusion of the “corpuscle”

1900 Max Planck First to propose that there is a minimum size quanta in which atoms can absorb or release energy. 1904 Hantaro Nagaoka First to propose a “Saturnian” model of the atom.

1905 Albert Einstein First successful explanation of the photoelectric effect.

1909 Robert Millikan First successful measurement of the elementary charge of an electron. 1911 Ernest Rutherford First to propose a planetary model of the atom with a nucleus at the center and electrons in orbits around it. 1913 Niels Bohr First model that restricts an electron to specific energy levels. 1923 Arthur Compton First to accurately describe the scattering of x-rays.

1924 Louis Debroglie First to propose that an orbiting electron has a particular wavelength associated with it. 1925 Wolfgang Pauli First to assert that no electron can have the same set of quantum numbers at the same time. 1926 Erwin Schrodinger First to provide both the wave and particle properties of the electron in one equation. 1927 Werner Heisenberg First to assert that it is impossible to know both the exact momentum of an electron and its exact location in space at the same time. 1932 James Chadwick First to prove the existence of the neutron.

------History of Physics Review Timeline------

Extra for experts!

1958 James Van Allen Astronomer that first understood the interaction between the earth’s magnetic field and the energetic particles trapped in it. 1865 James Maxwell First physicist to confirm the relationship between electricity and magnetism. 2245 James T Kirk Captain of the Starship Enterprise NCC1701 and NCC1701a.