Wilhelm Conrad Röntgen received the award for discovering X-rays.[ref] The Röntgen X-ray discovery experiment follows how a glowing screen led to tests of a new penetrating electromagnetic radiation.
Lord Rayleigh received the award for gas-mass density investigations and the discovery of argon.[ref] The Rayleigh-Ramsay argon density experiment shows how a small reproducible density discrepancy can reveal a new chemical element.
Nobel Prize in Physics in 1905 Created 2026-10-18 Updated 2026-10-20
Philipp Lenard received the award for research on cathode rays.[ref] The Lenard cathode-ray window experiment separates the source region from the region where the emerging electrons are studied.
Nobel Prize in Physics in 1906 Created 2026-10-18 Updated 2026-10-20
Joseph John Thomson received the award for theoretical and experimental research on electric currents through gases.[ref] The Thomson charge-to-mass experiment connects cathode rays to the measurable charge-to-mass ratio of an electron.
Albert Abraham Michelson received the award for precise optical instruments and their use in spectroscopy and metrology.[ref] The Michelson interferometer converts relative wave phase into a readout for precise length measurements.
Gabriel Lippmann received the award for a photographic colour-recording method based on interference.[ref] The Lippmann colour-recording experiment stores a standing wave pattern in a photographic layer.
Awarded to Gustaf Dalén for automatic regulators used with gas accumulators for lighthouse and buoy lighting. The sun valve and Dalén light connect the award to mechanical engineering.[ref]
Awarded to Heike Kamerlingh Onnes for investigations of matter at low temperatures, including helium liquefaction. The award's scope includes the experimental means of reaching those conditions.[ref]
Awarded to Charles Glover Barkla for characteristic X-rays of the chemical elements; he received it in 1918. The Barkla characteristic X-ray experiment describes the experimental separation of components.[ref]
Awarded to Max Planck for the discovery of energy quanta; he received it in 1919. Planck's law connects quantization with the measured spectrum of black-body radiation.[ref]

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