| 21. | It also describes the possibility of atomic energy levels being split by a magnetic field ( called the Zeeman effect ).
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| 22. | No field can be measured directly from the Zeeman effect because of the star's rotation-broadened spectral lines.
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| 23. | In 1925, the concept of spin had allowed physicists to explain the Zeeman effect, but it also created unexplained anomalies.
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| 24. | A theory about the magnetic sense of birds assumes that a protein in the retina is changed due to the Zeeman effect.
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| 25. | Thus the strength and direction of the star's magnetic field can be determined by examination of the Zeeman effect lines.
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| 26. | With Goudsmit he investigated the Zeeman effect of hyperfine structure of atomic levels, which became the subject of his 1930 PhD thesis.
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| 27. | He worked first with Pierre Weiss on the Zeeman effect, the splitting of spectral lines in the presence of a magnetic field.
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| 28. | He then proceeded to University of G�ttingen, where, guided by Woldemar Voigt, he wrote his dissertation on the Zeeman effect.
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| 29. | In the context of walking droplets, an analogous Zeeman Effect can be demonstrated by observing orbiting droplets in a vibrating fluid bath.
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| 30. | In the former case, the applied electric field splits the atomic energy levels and is the electric field analog of the Zeeman effect.
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