Physics Discoveries & Natural Laws
Foundational discoveries in physics restructured the scientific understanding of energy, matter, and spacetime. Michael Faraday discovered electromagnetic induction in 1831, establishing that a changing magnetic flux induces an electromotive force, which enabled the development of electric generators and transformers. James Clerk Maxwell unified electricity, magnetism, and optics into classical electromagnetism through Maxwell's equations in 1865. In 1897, J.J. Thomson discovered the electron using cathode ray tubes, proving atoms are divisible. Max Planck introduced quantum theory in 1900 by proposing that energy is quantized in discrete packets ($E=h\nu$), while Albert Einstein explained the photoelectric effect in 1905, establishing wave-particle duality and earning the 1921 Nobel Prize in Physics.
Key Concepts & Examination Highlights
- Michael Faraday formulated the laws of electromagnetic induction in 1831, demonstrating that changing magnetic fields induce electric currents.
- Albert Einstein was awarded the 1921 Nobel Prize in Physics specifically for his theoretical explanation of the photoelectric effect using light quanta.
- J.J. Thomson discovered the electron in 1897 through experiments with cathode ray tubes, proposing the plum pudding atomic model.