ISP209s8 Lecture 14: Electromagnetic Waves and Quantum Mechanics, Assignments of Physical Education and Motor Learning

Download ISP209s8 Lecture 14: Electromagnetic Waves and Quantum Mechanics and more Assignments Physical Education and Motor Learning in PDF only on Docsity! ISP209s8 Lecture 14 -1- Today • Announcements: – HW#7 is due after Spring Break on Wednesday March 12th – Exam #2 is on Thursday after Spring Break – The fourth extra credit project will be a “super bonus” points project. This extra credit can let your homework score go over 100% • Light • Wave-particle duality of nature • Quantum Mechanics ISP209s8 Lecture 14 -2- The Electromagnetic Spectrum • Maxwell’s 4 equations describe the unity of electric and magnetic forces. • They predict an electromagnetic wave that travels at the speed of c (3.00E+8 m/s) ISP209s8 Lecture 14 -3- Wavelength and Frequency λ = 1.0 m Wavelength Frequency = 1/period Distance over which the wave repeats Number of cycles (repeats) per second. period = 2.0 s ISP209s8 Lecture 14 -4- The Electromagnetic Spectrum Prentice-Hall 2005 Speed = λ f λ – wavelength f – Frequency, Hz (1/period)(1/s) For light Speed c = 3.0E+8m/s ISP209s8 Lecture 14 -5- What is Light? • Wave Picture – oscillating electric and magnetic fields • Waves can interfere • Examples – 2-slit interference – diffraction 2-slit interference diffraction ISP209s8 Lecture 14 -6- Light as a particle • Light also behaves like a particle • Light comes in small bundles of energy we call photons • Energy (of a photon) = h f h = 6.625E-34 Js = 4.136E-15 eVs ISP209s8 Lecture 14 -7- Around Visible Electromagnetic Spectrum ISP209s8 Lecture 14 -8- Explanation of Electric Forces and Gravity Coulomb’s Law (Electric Force) Coulomb force is carried by photons Newton’s Universal Law of Gravity: 2 2 2 21 11673.6; kg NmEG r mGmF −== 2 2 2 21 999.8; C NmEk r qkqF +== Gravity is carried by the graviton.