The Nature of Light Chapter Five.

Slides:

Advertisements

Similar presentations

Lecture 7 ASTR 111 – Section 002.

Advertisements

My Chapter 22 Lecture.

The Nature of Light Chapter Five.

Chapter 4 The Electromagnetic Spectrum Part 1. Demonstration Gas spectral tubes: NeonArgon.

Light. Properties Light is key to understanding the universe by analyzing light; we learn what planets & stars are made of and their temperature. Light.

Inorganic chemistry Assistance Lecturer Amjad Ahmed Jumaa  Calculating the number of atoms in a given amount of a compound.  Calculating.

Radiant Energy Objectives: 1. Describe a wave in terms of its frequency, speed, and amplitude. 2. Identify the major regions of the electromagnetic spectrum.

The Nature of Light Chapter Five. Determining the Speed of Light Galileo tried unsuccessfully to determine the speed of light using an assistant with.

Astronomy 101 Section 020 Lecture 5 The Nature of Light John T. McGraw, Professor Laurel Ladwig, Planetarium Manager.

Lecture 11 ASTR 111 – Section 002. Outline Short review on interpreting equations Light –Suggested reading: Chapter and of textbook.

Wavelength – λ – distance between successive points on a wave (crest to crest)

Astronomy 1 – Winter 2011 Lecture 6; January

Wave Nature of Light and Quantum Theory

The Nature of Light Chapter Five. Guiding Questions 1.How fast does light travel? How can this speed be measured? 2.Why do we think light is a wave? What.

Lecture 11 ASTR 111 – Section 002.

Light. Light Terminology Which is not a measure we use to identify a type of light? A. Wavelength B. Speed C. Frequency D. Energy.

Chapter 5: Light.

Section 4.6—Light. Light is Electromagnetic Radiation Electromagnetic energy is energy that has electric and magnetic fields There are many types of Electromagnetic.

Atomic Theory and Spectroscopy Clues to the Nature of Atoms.

Electromagnetic Radiation The speed of electromagnetic radiation (speed of light) is constant at x 10 m/s – We’ll express it as 3x10 m/s – The symbol.

CHAPTER 3 (p ) Light. Only a very small range of wavelengths, 400nm to 700nm, are visible to humans. Wavelengths are very small so astronomers use.

Section 5.3 Physics and the Quantum Mechanical Model

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.

Physics Mrs. Coyle. Electromagnetic Waves: oscillating electric and magnetic fields.

Facts about photons PHOTONS n Smallest quantity of electromagnetic radiation n bundle of energy (AKA quantum) n travels at 186,400 miles per second n.

The nature of …and a history of our attempt to understand it.

Standard: 1i, 1j terms: p article: 144 mastering concept: 146(30-38) practice prblems: 121(1-4), 124(5-6 lab write up: 125 home lab:954 #5 Homework.

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.

Chapter 7 Electronic Structure of Atoms. The Wave Nature of Light The electronic structure of an atom refers to the arrangement of the electrons. Visible.

5.1 Electromagnetic Radiation. Wave motion The transfer of energy without matter is called wave motion Two Types.

Electron As a Particle and Wave Electrons get excited when energy is absorbed by using heat or electrical energy Electrons get excited when energy is absorbed.

ELECTROMAGNETIC RADIATION subatomic particles (electron, photon, etc) have both PARTICLE and WAVE properties Light is electromagnetic radiation - crossed.

Electromagnetic Spectrum Basics Pg

Chemistry – Chapter 4. Rutherford’s Atomic Model.

The Nature of Light  Light is the only form of energy that can travel like a wave through empty space and some materials.  It behaves like a special.

Light!. General Properties of Light Isaac Newton: believed light was a series of fast moving small particles Now we know: light behaves both as particles.

Electrons and the Electromagnetic Spectrum. Electromagnetic Radiation: energy that exhibits wavelike behavior and travels at the same speed Properties.

Electromagnetic Spectrum Chemistry 6(B). Lesson Objectives Explore the electromagnetic spectrum Understand the mathematical relationships between energy,

Light Waves Waves in Empty Space – Don’t Write This!! Light from the Moon has traveled through space that contains almost no matter. You can see.

Using Planck’s Constant…. Picture credit: He was a German physicist and is considered as the founder.

Introducing Astronomy (chap. 1-6) Introduction To Modern Astronomy I Ch1: Astronomy and the Universe Ch2: Knowing the Heavens Ch3: Eclipses and the Motion.

EM SPECTRUM Chapter 4 EM Spectrum with Frequency and Wavelength.

Electromagnetic Spectrum Calculations

CHAPTER 3: Light.

Electrons in Atoms Chapter 4.

The Electromagnetic Spectrum Part 1

Radiant Energy Objectives:

Electromagnetic Radiation

Section 1 Characteristics of Light

Light Physics Mrs. Coyle.

SCH4C Matter & Qualitative Analysis

Light Physics Mr. Berman.

What is light?.

Chapter 4 The Wave Description of Light

The Electromagnetic Spectrum

Properties of light.

Electromagnetic radiation

EM SPECTRUM Chapter 4 EM Spectrum with Frequency and Wavelength.

WHAT THE HECK DO I NEED TO BE ABLE TO DO?

Light and the Electromagnetic Spectrum

Waves and Electromagnetic Radiation

Electromagnetic Spectrum

The nature of light.

5.2 Properties of Light Our goals for learning What is light?

The Nature of Light Chapter Five.

Properties of light Optics Unit.

Quantum Physics – Photons Mr Nesbo

The Electronic Structure of Atoms

Electromagnetic Spectrum

Presentation transcript:

The Nature of Light Chapter Five

Determining the Speed of Light Galileo tried unsuccessfully to determine the speed of light using an assistant with a lantern on a distant hilltop

Light travels through empty space at a speed of 3 x 108 m/s In 1676, Danish astronomer Olaus Rømer discovered that the exact time of eclipses of Jupiter’s moons depended on the distance of Jupiter to Earth This happens because it takes varying times for light to travel the varying distance between Earth and Jupiter Using d=rt with a known distance and a measured time gave the speed (rate) of the light

Light is electromagnetic radiation and is characterized by its wavelength ()

Wavelength and Frequency

Because of its electric and magnetic properties, light is also called electromagnetic radiation Visible light falls in the 400 to 700 nm range Stars, galaxies and other objects emit light in all wavelengths

Light, Photons and Planck Planck’s law relates the energy of a photon to its frequency or wavelength E = energy of a photon h = Planck’s constant v = frequency of an electrmagnetic wave The value of the constant h in this equation, called Planck’s constant, has been shown in laboratory experiments to be h = 6.6 x 10–34 J s E =hv

Example If you were exposed to electromagnetic radiation with a frequency of 7.21 x 1018 s–1, what would the wavelength be and should you be worried about it?

Given: v = 7.21 x 1018 s–1 λ = ? c = λv  λ = c/v = (3 x 108 m/s)/(7.21 x 1018 s–1) λ = 4.16 x 10-11 m