President of Switzerland
Begins a one-year term as President of the Swiss Confederation.
Permanent historical records · Updated 2026-11-03
1905 in Switzerland
Explore 11 historical events and records for Switzerland in 1905.
Historical records for Switzerland in 1905
Sorted by month and day. Records with no month are shown last. Showing 11 of 11 unique records.
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January
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Gas Ionization Considered with Light Quanta
Einstein discussed photoionization as another possible application of localized radiation quanta, connecting the frequency of light with the energy needed to remove charged particles from matter.
Light Frequency Linked to Electron Energy
Einstein distinguished brightness from frequency by predicting that raising the frequency of incident light increases the energy of individual photoelectrons rather than merely increasing their number.
Light Intensity Linked to Photoelectron Number
Einstein's quantum account implied that increasing light intensity at fixed frequency mainly increases the number of available energy quanta and therefore the number of emitted electrons.
Light-Quantum Energy Frequency Relation Applied
Einstein applied the relation between quantum energy and radiation frequency to individual light quanta, giving each localized packet an energy proportional to its frequency.
Light-Quantum Hypothesis Introduced
Einstein proposed that under appropriate conditions electromagnetic radiation behaves as independently localized energy quanta, extending Planck's quantum relation from material oscillators to light itself.
Localized Radiation Energy Challenges Wave Picture
Einstein explicitly contrasted spatially localized light quanta with a purely continuous wave description, creating a fundamental tension that later developed into wave-particle duality.
Photoelectric Threshold Frequency Law
Einstein explained that photoelectron emission requires incident light above a material-dependent threshold frequency, regardless of how intense lower-frequency illumination becomes.
Photoelectron Maximum Energy Equation
Einstein related the maximum kinetic energy of emitted electrons to the incident light frequency minus the work required to free an electron from the material.
Radiation Entropy Compared with Particle Gas
Einstein compared the entropy of high-frequency radiation with that of a dilute gas and found a formal similarity that supported treating radiation energy as independently distributed quanta.
Stokes Rule Interpreted through Light Quanta
Einstein used the light-quantum hypothesis to interpret Stokes's rule for fluorescence, arguing that emitted light normally cannot carry a higher quantum energy than the absorbed radiation.
How these records were prepared
Generated from the World History Database historical_events table. Identical display records are collapsed; descriptions otherwise retain the stored text. Coverage and source quality vary. Check primary and specialist sources before citing individual historical claims.