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Isaac Newton 1643 - 1727
From Physics class: F g = 9.8 N / kg (mass 2 ) 9.8 N / kg = Gm 1 / r 2 N = m / s 2 * kg G = 6.67 x 10 -11 Nm 2 /kg 2
Light behaves like small particles - corpuscles Light travels in straight lines Reflect off opaque surfaces Penetrate transparent materials White light made of colors
Newton Problems with Reflecting Telescopes * Longer focal length harder to make * Chromatic Aberration
Light behaves like waves –1600s Christian Huygens Refraction & Reflection explained by wave theory of light Problem – can’t see around corners
By 1800 Light has component parts Light behaves as a particle
William Herschel 1738 – 1822 – Discovers Infra-red
1801 Johann Wilhelm Ritter discovers Ultraviolet Light
–1827 Thomas Young and Augustin Fresnel Measures wavelength Observes interference of waves http://micro.magnet.fsu.edu/primer/java/interference/doubleslit/
1820 Hans Christian Ørsted –Discovers relationship between electricity & magnetism –In 1802 Italian Gian Domenico Romagnosi had already announced this was ignored
1845 Michael Faraday –Fields
Electric Fields Magnetic Fields
Michael Faraday Light affected by a magnetic field
1873 James Clerk Maxwell – finds the mathematical relationship between electric fields and magnetic fields
Electromagnetic Waves 1.Visible light is EM energy 2.There should be other EM frequencies
1889 Heinrich Hertz –Produces small electromagnetic waves that have properties of light –Produces Radio Waves or “Hertzian waves”
1895 Wilhelm Roentgen –Discovers X - Rays
By 1900 Light, Radio and X-rays are Electromagnetic Waves
1914 Gamma Rays Included –Henri Becquerel “Becquerel’s Rays” Radioactivity –Marie & Pierre Curie discover new elements Polonium & Radium –Paul Villard finds stronger rays emitted by radium –1914 Ernest Rutherford measures wavelength
1930 Microwaves Explored –WW II pushes research –Commercial Research after war
Early 1900s We know “light” is a form of electromagnetic radiation There are many different “kinds” of light or electromagnetic radiation
Think of Light as a stream of particles Each particle has a certain amount of energy
Is Light a Wave or a Particle? Wave Particle Duality
Isaac Newton Light behaves like small particles - corpuscles Light travels in straight lines Reflect off opaque surfaces Penetrate transparent.
Let there be... Light The Nature of Light What is Light? By the 17th century, light had been observed to… 1. travel in straight lines 1. travel in straight.
5-1 How we measure the speed of light 5-2 How we know that light is an electromagnetic wave 5-3 How an object’s temperature is related to the radiation.
The Nature of Light Waves vs. Particles. Particle (Corpuscular) Theory Advocated by Newton ( ) Said energy is carried by tiny particles from source.
Fall 2014Astron 1Instructor: Babar Ali Visible spectrum of the sun.
Chapter 3 Light and Telescopes. What do you think? What is the main purpose of a telescope? Why do stars twinkle?
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Discovery of Radioactivity. at the end of the 1800’s … Roentgen BecquerelCurieX-rays Uranium emits something!Radioactivity.
〉 How do scientific models describe light? 〉 The two most common models describe light either as a wave or as a stream of particles.
Guiding Questions 1. How fast does light travel? How can this speed be measured? 2. Why do we think light is a wave? What kind of wave is it? 3. How is.
Electromagnetic waves are formed when an electric field couples with a magnetic field. The magnetic and electric fields of an electromagnetic wave are.
WAVE PARTICLE DUALITY Principles of Physics. Is light a wave or a particle?? Isaac Newton said light is a particle Christian Huygens (explained diffraction)
Sound and LightSection 2 Waves and Particles 〉 How do scientific models describe light? 〉 The two most common models describe light either as a wave or.
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Solids and Light – Introduction to Light. Light – Wave or Particle? Evidence for Particle “White” light can be separated into colors, but colors cannot.
Let’s review electromagnetism. Electric Generator.
Lecture 20 Electromagnetic Waves Nature of Light Reflection and Refraction.
The Electromagnetic Spectrum. Electromagnetic Spectrum Definition: It is a range of all types of electromagnetic radiation Nickname: EMS.
Light. I. What is Light? A. Isaac Newton White light is composed of _____________.
Students will be able to define electromagnetic radiation. Students will be able to explain how telescopes work. Students will be able to describe.
QW 1-14 Draw a Venn Diagram to compare and contrast Transverse and Longitudinal Waves.
Sound and LightSection 2 Section 2: The Nature of Light STANDARDS: SC.912.P Explore the theory of electromagnetism by comparing and contrasting.
Nature of Light ● And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness.
Waves and the Electromagnetic Spectrum
Waves and Light. Wave A DISTURBANCE that transfers ENERGY from place to place. A DISTURBANCE that transfers ENERGY from place to place.
Bellwork What is the majority of the volume of an atom?
Sound and LightSection 2 EQ: How can I explain the characteristics of waves?
Lecture Outline Light ELECTROMAGNETIC SPECTRUM. What Is Light? Take out a piece of paper Answer the question.
Electromagnetic Radiation. Electromagnetic Spectrum.
1) wavelength 2) frequency 3) period 4) amplitude 5) energy The distance between successive wave crests defines the ________ of a wave. Question 1.
Visible light and the electromagnetic spectrum. we can’t see all types of light! Visible light is a very small part of a large range of radiations. It.
Electric Charge and Field Basics Fundamental charges are carried by electrons (negative) and protons (positive). Charge on the electron is – 1.6 x
Light and Optics The Electromagnetic Spectrum Interference, Diffraction, and Polarization Wave Properties of Light.
ISP Astronomy Gary D. Westfall1Lecture 6 The Nature of Light Light and other forms of radiation carry information to us from distance astronomical.
Sound and LightSection 2 Section 2: The Nature of Light Preview Key Ideas Bellringer Waves and Particles Energy of a Photon The Electromagnetic Spectrum.
© Boardworks Ltd of 9. © Boardworks Ltd of 9 What are electromagnetic waves? What’s the connection between light, microwaves and X-rays? Electromagnetic.
Index Unit 03 Electron Configuration Module 01: Light as a Wave Based on the PowerPoints By Mr. Kevin Boudreaux, Angelo State Univerisity U03Mod01 Light.
The Electromagnetic Spectrum Coach Smith. EM Spectrum 0 Types 0 Radio 0 Microwave 0 Infrared 0 Visible light 0 Ultraviolet 0 X-rays 0 Gamma rays.
Chapter 18 Review. 1. In 1926, Michelson was able to measure the speed of light using A lanterns. B stars. C mirrors. D sunlight.
A Walk Through the Electromagnetic Spectrum Ken Morgan ENGR302 May 7, 2002.
Whiteboard Warmup! A glass lens of refractive index n = 1.6 has a focal length of 30 cm while in air. What would happen to the focal length of the lens.
WAVES MEDIUM VIBRATES PERPENDICULARLY TO THE WAVE DIRECTION IF f IS THE WAVE FREQUENCE AND λ IS THE WAVELEGTH THEN c, THE WAVE VELOCITY, IS GIVEN BY: c.
Light. Properties Light is key to understanding the universe by analyzing light; we learn what planets & stars are made of and their temperature. Light.
5.1 Electromagnetic Radiation. Wave motion The transfer of energy without matter is called wave motion Two Types.
Light. electromagnetic radiation that is visible to the human eye, and is responsible for the sense of sight. People make and use light for many other.
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