Topic
Quantum theory
5 questions tagged Quantum theory — spanning every one of the seven Ws.
whose
Whose model placed electrons in fixed orbits around the nucleus?
Niels Bohr’s atomic model. In 1913, he used quantized orbits to explain atomic spectra.
PhysicsQuantum theory
whose
Whose work first explained the photoelectric effect and helped launch quantum theory?
Albert Einstein’s 1905 explanation of the photoelectric effect. He showed that light can act as discrete packets of energy called photons.
PhysicsQuantum theory
whose
Whose discovery made precise atomic spectra possible to explain with quantized energy levels?
Max Planck’s quantum hypothesis. In 1900 he proposed that energy is emitted in discrete packets called quanta.
PhysicsQuantum theory
when
When did physicists first calculate a reliable range for the strong nuclear force?
In 1935, Yukawa’s theory predicted a very short-range nuclear force, with the exchange particle concept giving a range of about 10^-15 meters.
PhysicsQuantum theory
when
When was the Casimir effect first predicted?
In 1948, Hendrik Casimir predicted a force arising from quantum vacuum fluctuations between metal plates. It became an important example of quantum field effects.
PhysicsQuantum theory