Formulated 1/lambda = R_H (1/n1^2 - 1/n2^2) unifying atomic emission line series.

Hertz confirms Maxwellian electromagnetic waves and discovers the Photoelectric Effect.

The most famous null result in physics history, disproving luminiferous ether drift.

Arrhenius formulates the chemical rate equation k = A exp(-Ea / RT), introducing activation energy.

Voigt formulates mathematical coordinate transformations preserving the 3D wave equation.

Constructed LC spark transmitter and ring receiver, generating and detecting radio waves.

Discovered that ultraviolet light ejects electric charges from metal spark electrodes.

Derived the Arrhenius Equation (k = A exp(-Ea / RT)) governing chemical reaction rates.

Executed famous floating interferometer test obtaining null result.