Modern Physics — Key Discoveries
Key Discoveries
Planck's Quantum Hypothesis
1900Max Planck introduced the revolutionary idea that energy is not continuous but is emitted and absorbed in discrete packets, or 'quanta'. This hypothesis, initially proposed to…
Einstein's Explanation of the Photoelectric Effect
1905Albert Einstein, building on Planck's work, proposed that light itself consists of discrete energy packets called photons. This explanation successfully accounted for all…
Einstein's Special Theory of Relativity
1905Einstein's Special Theory of Relativity revolutionized our understanding of space and time. Based on two postulates (constancy of the speed of light and relativity principle), it…
Heisenberg's Uncertainty Principle
1927Werner Heisenberg formulated the Uncertainty Principle, stating that it is impossible to simultaneously know with perfect precision certain pairs of complementary properties of a…
Discovery of the Neutron (Chadwick)
1932James Chadwick discovered the neutron, an uncharged particle with a mass nearly equal to that of a proton. This discovery completed the model of the atomic nucleus, explaining…