GREPhysics.NET: GR8677 #82

GR8677 #82

Problem

GREPhysics.NET Official Solution

Atomic $\Rightarrow$ }Emission Lines

(A) The Stern-Gerlach effect has to do with splitting of beams of atoms sent through an inhomogenous magnetic field. Does not have to do with emission spectrum.

(B) The Stark effect has to do with energy shifts via placing atom(s) in an Electric field.

(C) Splitting is often due to electron spin magnetic moments.

(D) The condition is much too rigid.

(E) Splitting of energies means more lines than before. This choice is general enough to be true.

(The effect of energy shifts due to placing an atom in a magnetic field is called the Zeeman Effect, which isn't listed.)

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Comments

timsaucer
2006-11-01 12:43:48

The electrons in the atoms have magnetic moment due to both their angular orbital momentum (when applicable) and their spin. When you apply the external magnetic field, it will couple with the magnetic moment either parallel or anti-parallel. The coupling will change the energy level of the electron (referred to as splitting). The splitting energy levels causes more spectral lines.

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Healeyx76
2006-10-24 11:41:58

Splitting of energies means more lines than before.

Why do you assume splitting of energies? All the problem states is that it differs. Why couldn't it be less?

Rune
2007-10-15 21:14:15

Because that is what actually happens when you put an atom in a magnetic field, known as the Zeeman effect. I don't think I've ever heard of anyone observing lines actually collapsing on eachother due to placing an atom in a magnetic field.

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