Question 1 of 5

Which important publication starts with the following sentence?

“It is known that several substances have the property of producing certain bright lines when brought into the flame.”

• On the Quantum Theory of Radiation,
  Albert Einstein, 1917.
• Chemical Analysis by Observation of Spectra,
  Gustav Kirchhoff, Robert Bunsen, 1860.
• The Theory of Heat Radiation,
  Max Planck, 1914.

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