Arnold Johannes Wilhelm Sommerfeld (5 December 1868 – 26 April 1951) was a German theoretical physicist who pioneered developments in atomic and quantum physic...

After the discovery of spectral analysis no one trained in physics could doubt the problem of the atom would be solved when physicists had learned to understand the language of spectra. Arnold Sommerfeld

After the discovery of spectral analysis no one trained in physics could doubt the problem of the atom would be solved when physicists had learned to understand the language of spectra.

If I knew something about it, I wouldn’t lecture on it! Arnold Sommerfeld

If I knew something about it, I wouldn’t lecture on it!

Mathematics is like childhood diseases. The younger you get it, the better. Arnold Sommerfeld

Mathematics is like childhood diseases. The younger you get it, the better.

If you want to be a physicist, you must do three things-first, study mathematics, second, study more mathematics, and third, do the same. Arnold Sommerfeld

If you want to be a physicist, you must do three things-first, study mathematics, second, study more mathematics, and third, do the same.

Moreover I can assure you that the misuse word “national” by our rulers has thoroughly broken me of the habit of national feeling that was pronounced in my case. I would now be willing see Germany disappear as a power and merge into a pacified Europe. Arnold Sommerfeld

Moreover I can assure you that the misuse word “national” by our rulers has thoroughly broken me of the habit of national feeling that was pronounced in my case. I would now be willing see Germany disappear as a power and merge into a pacified Europe.

Consciously and systematically Klein sought to enthrall me with the problems of mathematical physics, and to win me over to his conception of these problems as developed it in lecture courses in previous years. Arnold Sommerfeld

Consciously and systematically Klein sought to enthrall me with the problems of mathematical physics, and to win me over to his conception of these problems as developed it in lecture courses in previous years.

I have always regarded Klein as my real teacher only in things mathematical, but also in mathematical physics and in my conception of mechanics. Arnold Sommerfeld

I have always regarded Klein as my real teacher only in things mathematical, but also in mathematical physics and in my conception of mechanics.

An almost greater enlightenment has resulted from the seven years of Röntgen spectroscopy, inasmuch as it has attacked the problem of the atom at its very root, and illuminates the interior. Arnold Sommerfeld

An almost greater enlightenment has resulted from the seven years of Röntgen spectroscopy, inasmuch as it has attacked the problem of the atom at its very root, and illuminates the interior.

The same applies to the concept of force as does to any other physical concept: Verbal definitions are meaningless; real definitions are given through a measuring process. Arnold Sommerfeld

The same applies to the concept of force as does to any other physical concept: Verbal definitions are meaningless; real definitions are given through a measuring process.

My father, the practicing physician, … was a passionate collector of natural objects (amber, shells, minerals, beetles, etc.) and a great friend of the natural sciences. … To my energetic and intellectually vigorous mother I owe an infinite debt. Arnold Sommerfeld

My father, the practicing physician, … was a passionate collector of natural objects (amber, shells, minerals, beetles, etc.) and a great friend of the natural sciences. … To my energetic and intellectually vigorous mother I owe an infinite debt.

[Before college] I was almost more interested in literature and history than in the exact sciences; I was equally good in all subjects including the classical languages. Arnold Sommerfeld

[Before college] I was almost more interested in literature and history than in the exact sciences; I was equally good in all subjects including the classical languages.

So manifold was the enormous amount of material that has been accumulated in sixty years of spectroscopic research that it seemed at first beyond the possibility of disentanglement. Arnold Sommerfeld

So manifold was the enormous amount of material that has been accumulated in sixty years of spectroscopic research that it seemed at first beyond the possibility of disentanglement.