Chemistry teacher

 Heisenberg’s Uncertainty Principle (NEET – Structure of Atom) Electron cannot have exact position and momentum at the same time due to Heisenberg’s Uncertainty Principle. Heisenberg’s Uncertainty Principle (1927) Werner Heisenberg was a German physicist. In 1927, he proposed the Uncertainty Principle . It is a direct result of the dual nature of matter and radiation (wave–particle duality). Statement of the Principle It is impossible to measure simultaneously : exact position of an electron exact momentum (or velocity) of an electron If one is known more accurately, the other becomes less accurate. Mathematical Expression \Delta x \cdot \Delta p_x \ge \frac{h}{4\pi} OR \Delta x \cdot \Delta v_x \ge \frac{h}{4\pi m} Where: Δx = uncertainty in position Δpx = uncertainty in momentum Δvx = uncertainty in velocity h = Planck’s constant m = mass of particle (electron) Important Meaning of Formula If Δx is small (position known accurately) → Δv (v...