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For under certain conditions the chemical atoms emit light waves of a specific length or oscillation frequency - their familiar characteristic spectra - and these can come in the form of electromagnetic waves only from accelerated electric quanta.

Johannes Stark

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Johannes Stark
Age: 83 †
Born: 1874
Born: April 15
Died: 1957
Died: June 21
Physicist
University Teacher
Wave
Chemicals
Oscillation
Conditions
Waves
Electromagnetic
Form
Atoms
Emit
Light
Electric
Accelerated
Certain
Characteristics
Frequency
Come
Length
Characteristic
Specific
Chemical
Spectra
Familiar
Quantum
Quanta

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The movement of the emitters of the spectral lines may be deduced on the basis of the Doppler principle.
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An external electric field, meeting it and passing through it, affects the negative as much as the positive quanta of the atom, and pushes the former to one side, and the latter in the other direction.
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A beam of luminous hydrogen canal rays has, owing to its velocity, exactly the same direction as that of the electric field in which it may be made to move.
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It is more likely that more than a century will pass before we know the structure of the chemical atoms as thoroughly as we do our solar system.
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The most common and most important result of them is that the nature and size of the effect on corresponding series of different elements are largely an expression of the peculiarity of their atomic structure - or, at least, of the structure of the surface.
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At the head of these new discoveries and insights comes the establishment of the facts that electricity is composed of discrete particles of equal size, or quanta, and that light is an electromagnetic wave motion.
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By allowing the positive ions to pass through an electric field and thus giving them a certain velocity, it is possible to distinguish them from the neutral, stationary atoms.
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Along a series of lines running from longer to shorter wavelengths the effect of the electric field becomes greater as the serial numbers increase - that is, as the wavelength decreases.
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We have learnt through experience that when an electrical ray strikes the surface of an atom, an electron, and in some circumstances a second and even a third electron, can be detached.
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The question of the composition of perceptible objects is one which already occupied the mind of the ancient Greeks.
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The emitters of the spectral series are without exception single atoms, not compounds of atoms.
Johannes Stark