NIELS BOHR

EARLY LIFE

• Born 7, 1885 in Copenhagen, Denmark
• Bohr attended Copenhagen university where he received his masters in physics by 1911.
• During the fall of the same year , Bohr traveled to Cambridge,England, where he was able to follow the cavendish laboratory work of scientist Jj Thomson .
• Bohrs greatest contribution to modern physics was the atomic model. The Bohr model shows the atom as a small positively charged nucleus surrounded by orbiting electrons.

BOHR MODEL

• The Bohr model depicts the atom as a small positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus, similar to the solar system but with attraction provided by electrostatic forces rather than gravity. The models key success lays in explaining the rydberg formula for the spectral emission lines of atomic hydrogen.

BOHR EXPERIMENT DATA

• Hydrogen atoms absorb light when an electron is excited from a low energy orbit into a higher orbit. Atoms that have been excited by an electric discharge can give off light when an electron drops off from a high energy orbit. The energy of the photon absorbed or emitted when the electron moves from one orbit to another is equal to the difference between the energies of the orbits.

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