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29B spectroscopy, quantum numbers

# 29B spectroscopy, quantum numbers - Quiz 4 Info Physics 1C...

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5/26/2011 1 Physics 1C Lecture 29B "Nuclear powered vacuum cleaners will probably be a reality within 10 years. " --Alex Lewyt, 1955 Quiz 4 Info It will be a Scantron test that covers Chapters 27 and 28. There will be 12 problems on this quiz. A list of equations, constants, and conversions will be provided on the last page. You are to write the version of your test on the Scantron form. You will use the Quiz Code Number that you were assigned at the first Quiz. You are expected to abide by UC Policy on Integrity of Scholarship. Problems with Bohr’s Model Bohr’s explanation of atomic spectra includes some features of the currently accepted theory. Bohr’s model includes both classical and non- classical ideas. He applied Planck’s ideas of quantized energy levels to orbiting electrons and Einstein’s concept of the photon to determine frequencies of transitions . Improved spectroscopic techniques, however, showed that many of the single spectral lines were actually groups of closely spaced lines. Single spectral lines could be split into three closely spaced lines when the atom was placed in a magnetic field. Quantum Numbers n is considered the principal quantum number . n can range from 1 to infinity in integer steps. But other quantum numbers were added later on to explain other subatomic effects (such as elliptical orbits; Arnold Sommerfeld (1868-1951). The orbital quantum number , , was then introduced. can range from 0 to n -1 in integer steps. Historically, all states with the same principal quantum number n are said to form a shell . Shells are identified by letters: K, L, M, … All states with given values of n and are said to form a subshell . Subshells: s, p, d, f, g, h , … Quantum Numbers Largest angular momentum will be associated with: = n – 1 This corresponds to a circular orbit.

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29B spectroscopy, quantum numbers - Quiz 4 Info Physics 1C...

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