The History of Physics Podcast

From Bohr’s hydrogen model to Schrödinger’s 1926 breakthrough, this episode traces how treating electrons as waves reshaped quantum mechanics, sparked debates between wave and matrix formalisms, and laid foundations for modern computational physics.

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In this episode we explore how Johann Kepler, armed with Tycho Brahe’s precise data, abandoned the age‑old belief in circular planetary orbits and introduced ellipses. This shift not only resolved stubborn discrepancies but also paved the way for Newton’s law of universal gravitation and the modern understanding of celestial mechanics.

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In 1905, Albert Einstein used the random jitter of pollen grains to argue that atoms were real. Jean Perrin’s meticulous experiments in 1908 confirmed Einstein’s predictions, tipping the physics community into accepting atomism and paving the way for quantum mechanics. This episode traces the science, debate, and cultural shift sparked by Brownian motion.

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In the late nineteenth century, measurements of hot objects’ glow revealed a glaring mismatch with classical predictions. This episode traces how Max Planck’s discrete energy hypothesis—born from the black‑body radiation problem—revolutionized physics, spawned quantum mechanics, and reshaped funding, publishing, and instrument development worldwide.

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July 16, 1945’s Trinity test marked the first controlled nuclear chain reaction in history. The precise match between measured neutron bursts and theoretical predictions validated a fledgling field of nuclear physics, reshaping science, engineering, and policy. Key figures—Oppenheimer, Bainbridge, Fermi—steered this pivotal moment that set the stage for modern energy and defense technology.

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Explore how Thomas Young’s 1801 double‑slit experiment shattered the particle view of light, ushered in wave physics, and set the stage for Maxwell, Einstein, and quantum mechanics. The episode traces the experiment’s origins, its reception, and its lasting impact on modern optics and technology.

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In this episode we follow Thales of Miletus as he uses a simple stick and a stone’s shadow to predict an eclipse, laying the groundwork for geometry‑based science. We explore how his method shifted Greek thought from mythic to mathematical, influencing later astronomers like Ptolemy and setting the stage for modern measurement techniques. The story shows how one observation in 600 B.C. echoes through GPS satellites, telescopes, and everyday technology.

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Discover how Lise Meitner and Otto Frisch applied Einstein’s mass‑energy equivalence to the baffling barium results from Otto Hahn’s experiments, revealing that uranium nuclei could split and release enormous energy. Their insight not only launched nuclear physics but also set the stage for the Manhattan Project and reshaped global power dynamics.

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This episode unpacks how Heinrich Lenard’s photoelectric experiments led Einstein to propose light quanta in 1905, sparking a revolution that bridged waves and particles. We trace the impact on quantum theory, experimental validation by Millikan, and lasting legacy for modern physics.

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From the Homestake radiochemical experiment in the 1960s to the Sudbury Neutrino Observatory’s definitive evidence for flavor change, this episode traces how a stubborn shortfall in solar neutrino counts reshaped particle physics and revealed that neutrinos have mass. It highlights key figures—Raymond Davis Jr., John Bahcall, Bruno Pontecorvo—and the international collaborations that turned theory into experiment.

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