chapter05 - Chapter 5 Light and Matter: Reading Messages...

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Unformatted text preview: Chapter 5 Light and Matter: Reading Messages from the Cosmos 5.1 Light in Everyday Life Our goals for learning How do we experience light? How do light and matter interact? How do we experience light? The warmth of sunlight tells us that light is a form of energy We can measure the flow of energy in light in units of watts: 1 watt = 1 joule/s Colors of Light White light is made up of many different colors How do light and matter interact? Emission Absorption Transmission Transparent objects transmit light Opaque objects block (absorb) light Reflection or Scattering Reflection and Scattering Mirror reflects light in a particular direction Movie screen scatters light in all directions Interactions of Light with Matter Interactions between light and matter determine the appearance of everything around us Thought Question Why is a rose red? a) The rose absorbs red light. b) The rose transmits red light. c) The rose emits red light. d) The rose reflects red light. Thought Question Why is a rose red? a) The rose absorbs red light. b) The rose transmits red light. c) The rose emits red light. d) The rose reflects red light. What have we learned? How do we experience light? Light is a form of energy Light comes in many colors that combine to form white light. How does light interact with matter? Matter can emit light, absorb light, transmit light, and reflect (or scatter) light. Interactions between light and matter determine the appearance of everything we see. 5.2 Properties of Light Our goals for learning What is light? What is the electromagnetic spectrum? What is light? Light can act either like a wave or like a particle Particles of light are called photons Waves A wave is a pattern of motion that can carry energy without carrying matter along with it Properties of Waves Wavelength is the distance between two wave peaks Frequency is the number of times per second that a wave vibrates up and down wave speed = wavelength x frequency Light: Electromagnetic Waves A light wave is a vibration of electric and magnetic fields Light interacts with charged particles through these electric and magnetic fields Wavelength and Frequency wavelength x frequency = speed of light = constant Particles of Light Particles of light are called photons Each photon has a wavelength and a frequency The energy of a photon depends on its frequency Wavelength, Frequency, and Energy x f = c = wavelength , f = frequency c = 3.00 x 10 8 m/s = speed of light E = h x f = photon energy h = 6.626 x 10-34 joule x s = photon energy Special Topic: Polarized Sunglasses Polarization describes the direction in which a light wave is vibrating Reflection can change the polarization of light Polarized sunglasses block light that reflects off of horizontal surfaces What is the electromagnetic spectrum? The Electromagnetic Spectrum...
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This note was uploaded on 03/03/2011 for the course RSM 100 taught by Professor Oesch during the Spring '08 term at University of Toronto- Toronto.

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chapter05 - Chapter 5 Light and Matter: Reading Messages...

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