A new picture of the world: physics
Before 1914 scientists thought of atoms as tiny solar systems. In the 1920s quantum mechanics (Heisenberg 1925–27, Schrödinger 1926) said that tiny particles follow rules of chance: we can only say where an electron is likely to be.
Einstein's general relativity (1915) said that gravity is the bending of space and time by matter. In 1919 an eclipse expedition saw starlight bend near the Sun as predicted, and Einstein became world-famous. In 1922 the Russian scientist Alexander Friedmann showed that the equations allow an expanding universe, and in 1929 Edwin Hubble found that far galaxies are moving away from us. In 1932 Chadwick found the neutron, and in 1938 Hahn and Strassmann split a uranium nucleus (fission).
Medicine and technology
- Insulin (1921–22): made diabetes a treatable illness.
- Penicillin (noticed 1928 by Alexander Fleming): the first antibiotic; it was turned into a medicine in the 1940s.
- Radio, television and film: the first regular radio broadcasts came in the early 1920s; television was demonstrated in 1926; sound film arrived in 1927.
- Transport: cars became common in some countries; aeroplanes crossed oceans (Lindbergh, 1927).
Many countries also ran big campaigns for reading and writing. The USSR, for example, held a mass literacy drive in the 1920s.
Mass culture: radio, cinema, sport and jazz
For the first time millions of people could hear the same voice or music at the same moment (radio) or watch the same story on a screen (cinema). This is called mass culture. Cinema moved from silent films to sound in 1927, with stars like Charlie Chaplin. Jazz music spread from the USA, and sport and cheap newspapers also built shared habits. Leaders learned to use radio and film to reach crowds, and some used them for propaganda (one-sided messages).
Modern art and new writing
Modernism means breaking old rules and trying new forms. The war had shaken confidence in the old order, so many artists did not want to copy the world exactly.
- Cubism (Picasso, Braque): shows an object from several sides at once.
- Abstract art (Kandinsky, Malevich's "Black Square", 1915): only shape and colour.
- Dada and Surrealism (1920s, Dalí): jokes against war and art rules, then paintings of dreams.
- Bauhaus (1919, Germany) and Le Corbusier: simple buildings and objects made for ordinary use.
- Writing: Joyce (Ulysses, 1922) and Woolf follow a person's thoughts; Kafka writes about people lost in confusing systems; Remarque (1929) tells a soldier's story of the war.
Culture in the USSR and in India
USSR: In the 1920s artists, poets and film-makers experimented freely (Mayakovsky, Malevich, Eisenstein). Education spread fast. From the early 1930s the state wanted art to serve the party; in 1934 the Writers' Congress made socialist realism the one official style: realistic pictures of workers and builders, with a hopeful message. Many experimental artists lost their freedom.
India: Rabindranath Tagore won the Nobel Prize in literature (1913). S. N. Bose (1924) gave a new way to count light particles, later called Bose-Einstein statistics, and C. V. Raman found the Raman effect (1928), winning the Nobel Prize in physics in 1930, the first Asian to win a science Nobel.
Key formulas and definitions
- Physics: relativity (1915) · quantum mechanics (1925–27) · expanding universe (Hubble 1929) · neutron (1932) · fission (1938)
- Medicine: insulin (1921) · penicillin (1928)
- Mass culture: radio (from 1922) · sound film (1927) · television demo (1926)
- Art: cubism · abstract art (Kandinsky, Malevich 1915) · surrealism (1924) · Bauhaus (1919); USSR: socialist realism (1934)
- India: Bose (1924), Raman effect (1928, Nobel 1930)
Worked examples
1. What did quantum mechanics change in the picture of the atom?
Earlier models showed electrons moving on fixed tracks like planets. Quantum mechanics said we can only give the chance of finding an electron in a region, not an exact path.
2. Why are radio and cinema called "mass media"?
One broadcast or one film can reach millions of people at the same time, so they shape shared tastes and news for a whole country, and can also be used for propaganda.
3. Why did many artists after 1914 stop painting realistic pictures?
The war and fast change shook faith in old rules. Artists also had photography and film to show things exactly, so painting turned to ideas, shapes, colours and dreams (cubism, abstract art, surrealism).
4. What changed for Soviet art in 1934?
The 1920s had been a time of free experiment. In 1934 the Writers' Congress made socialist realism the official style, so art had to show workers and builders in a realistic, hopeful way and serve the party.
Common mistakes
- Writing that Hubble discovered that the universe has a beginning in 1915. Hubble (1929) showed expansion; Einstein's relativity was 1915.
- Saying penicillin was a medicine in 1928. It was noticed in 1928 and made a usable medicine in the 1940s.
- Mixing cubism and abstract art. Cubism still shows an object, from many sides; abstract art uses pure shape and colour.
- Thinking all Soviet art was one style from 1917. Free experiment in the 1920s; socialist realism became official in 1934.