Quantum physics began in 1900 when the German physicist Max Planck determined the scale of quantum phenomena. In 1905, Albert ...

The classical scientific theories by which we understand the world around us do not hold good at the subatomic level. There, ...

So convincing is this model that after only twelve ... The Theory of Spectra and Atomic Constitution: Three Essays. By Prof. Niels Bohr. Pp. x + 126. (Cambridge: At the University Press, 1922.) ...

For a summary of the theory just previous to the development of the new methods the reader is referred to a lecture of the author, Atomic Theory and Mechanics,œ published In this periodical ...