Are Photons & Electrons Particles or Waves? Make up your mind god!

By the end of 1905, two new equations emerged: Planck's E = hf and Einstein's E = mc^2. Louis de Broglie combined them, suggesting mass is related to frequency. This led to the concept that particles are also waves. The double‑slit experiment demonstrates that photons behave as waves when unmeasured but as particles when measured, illustrating the measurement problem. In quantum mechanics, the Schrödinger equation governs the wave function ψ, whose squared magnitude gives the probability density of finding a particle. Thus, quantum objects are spread across space, unlike classical particles. The de Broglie wavelength λ = h/(mv) explains why macroscopic objects like sand grains or basketballs exhibit negligible wave behavior: their wavelengths are astronomically small, making quantum effects unobservable. 00:00 - World is quantized 2:17 - How de Broglie found particle wave duality 4:30 - Is a photon a wave or particle? Double slit experiment 7:59 - What is the wave function 9:57 - What is a particle intuitively? 10:34 - Why don't large things behave like quantum objects? 11:07 - What is de Broglie wavelength? 13:50 - What is a particle?