PPT-Section 1: Light and Quantized Energy

Chapter 9 Electrons in Atoms and the Periodic Table Learning Goals Compare the wave and particle natures of light Define a quantum of energy and explain how it is related to an energy change of matter. In quantized media storage times are typically limited due to stochastic interactions with the environment Also optical memories based on electromagnetically induced transparency EIT suffer strongly from such decoherent effects External magnetic con Day . 21. : . Questions? . Infinite/finite square well. Quantum tunneling. Next Week. :. Tunneling. Alpha-decay and radioactivity. Scanning Tunneling Microscopes. PH300 . Modern . Physics SP11. “The most incomprehensible thing about the world is that it is comprehensible.”– . LIGHT ENERGY &. ITS SOURCES. Discuss the following and are ready to give answers when prompted:. What are the sources of light?. How does a light bulb work?. What does luminous and non-luminous mean?. +. -. Photon coming into atom collides with electron. Photons are energy.. Electrons Absorbing Energy. +. -. Photon coming into atom collides with electron. Photons are energy.. Electrons Absorbing Energy. Energy is the ability to cause change. Any time a change occurs, energy is transferred from one object to another. Section One: What is energy? (pg. 375). Kinetic energy is the energy an object has due to its motion. If an object isn’t moving, it does not have kinetic energy.. Energy . Energy . exists. in many forms.. Energy . can. be moved from one object to another.. Energy . can. be changed from one form to another.. Energy . cannot. be created or destroyed.. What is Always Present . Ultraviolet (UV) light falls in the range of the EM spectrum between visible light and X-rays. UV . light, which comes from the sun, is invisible to the human eye. .. It . makes black-light posters glow, and is responsible for summer tans — and sunburns. (159). There . are countless numbers of chemical reactions occurring in every cell all the time. Virtually all of these reactions . require . the action . of _______. ,. . catalytic . __________. . . Objectives. Distinguish between endergonic and exergonic reactions.. Explain how ATP is used in linking the two types of reactions.. Compare the processes of aerobic respiration and fermentation.. Questions…. Standing waves. Quantum energy . of colors . Bohr Model . (particle picture). Assumptions. Nuclear model. Discrete electron orbits n = 1,2,3,... Light absorbed/emitted as quantum. . of energy when electron jumps orbit. Source of Energy. Autotrophs/producers. Ex.. Heterotrophs/consumers. Ex.. Types of energy. Light, heat, electric, chemical. Mechanical-total energy of a system. Kinetic. Potential-stored energy, two main ways to store energy. PROPERTIES OF LIGHT. Light are energy. It travel in the speed of . m/sec . It has dual nature of both wave and particles.. . As wave-. . It propagate itself through a disturbance of electric and magnetic field being perpendicular to each other.. 1. Recap. When a current-carrying . semiconductor or metal. is kept in a magnetic field, the charge carriers of the . semiconductor. experience a force in a direction perpendicular to both the magnetic field and the current. At equilibrium, a voltage appears at the . When light encounters a different medium it can either be reflected, absorbed, or pass through. Most of the time it is some level of each.. A blue shirt reflects blue light (and a few others) absorbs all other colors of light and allows small intensities of all colors (white light) to pass through. .