Examination #1. Range was pts Maximum pts =119 with the extra credit problem. Average grade of Examination #1 =89.7 or 90 pts out of 109
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1 Waves. Chapter 8
2 Examination #1 Range was pts Maximum pts =119 with the extra credit problem Average grade of Examination #1 =89.7 or 90 pts out of 109 Average of 82.6% Number of students that scored above 100 pts on exam 21 Highest grades..>108 Julia Zanotelli Kevin Salat Jennifer Poth Christian Metzier Bridget Mooney Nicolas Montoya Jameson Crawford Genevieve Bellon
3 Meteors typically cause sonic booms when they enter the Earth s atmosphere, and the one that occurred over Chelyabinsk was forceful enough to sha=er dishes and televisions in people s homes. Car alarms were triggered for miles around, and the roof of a zinc factory par@ally collapsed. Video clips, uploaded by the hundreds star@ng early Friday morning, showed ordinary mornings interrupted by a blinding flash and the sound of sha=ering glass. As residents of Chelyabinsk began their day on Friday, a 10- ton meteor around 10 feet in diameter was hurtling toward the Earth at a speed of about 10 to 12 miles per second, experts from the Russian Academy of Sciences reported in a statement released Friday. Scien@sts believe the meteor exploded upon hilng the lower atmosphere and disintegrated at an al@tude of about 20 to 30 miles above the Earth s surface not an especially unusual event, the statement said. NY Times Friday February 15, 2013
4 Asteroid: A rela@vely small, inac@ve body, composed of rock, carbon or metal, which is orbi@ng the Sun. Comet: A rela@vely small, some@mes ac@ve object, which is composed of dirt and ices. Comets are characterized by dust and gas tails when in proximity to the Sun. Far from the Sun it is difficult to dis@nguish an asteroid from a comet. Meteoroid: A small par@cle from an asteroid or comet orbi@ng the Sun. Meteor: A meteoroid that is observed as it burns up in the Earth's atmosphere - a shoo@ng star. Washington Post Meteorite: A meteoroid that survives its passage through the Earth's atmosphere and impacts the Earth's surface. h=p:// live- as- asteroid da14- whizzes- past- earth/
5 Energy Transfer by Waves Wave A traveling disturbance Properties of waves Wavelength Frequency Velocity Amplitude
6 The Doppler Effect h=p:// h=p:// d9a2oq1n38 Sonic Boom An echocardiogram uses sound waves to produce images of your heart. This commonly used test allows your doctor to see how your heart is and pumping blood. Your doctor can use the images from an echocardiogram to various in the heart muscle and valves. h=p://youtu.be/4cck1mxjhm0 Evidence that everything is moving away from us
7 The Electromagnetic Spectrum h=p://
8 The Electromagnetic Spectrum
9 Heat Escaping from People
10 Visible Light Visible light Range: 700nm 400nm Colors Slices of electromagnetic spectrum
11 A Glass Prism White Light
12 Path of Light through the Human Eye
13 The Atom Chapter 8 Great Idea: All of the matter around us is made of atoms, the chemical building blocks of our world
14 Chapter Outline The Smallest Pieces The Structure of the Atom When Matter Meets Light The Periodic Table of the Elements
15 Dividing a Bar of Gold
16 Elements John Dalton Father of modern atomic theory Cannot break down elements Elements composed of atoms Example: Water molecule is 1 oxygen atom and 2 hydrogen atoms
17 Everyday Elements Helium, carbon, aluminum, copper, gold
18 The Structure of the Atom
19 The Nuclear Regulatory Commission Logo: highly stylized atomic model
20 Bohr Atom
21 Electron Energy Levels
22 Atomic Model
23 Photons: Particles of Light Photon absorbed Used to move electron to a higher energy state Photon emitted as electron moves to lower energy state
24 Photons: of Light
25 Quantum leap or jump - electron disappears from original location and reappears in final locationnever at positions in between Photons - cont.
26 Spectroscopy Atoms emit and absorb different photons Depends on differences between energy levels Each atom has distinct set of photons Spectrum: all photons emitted by an atom Used for identification
27 Na, K, and Li Give Distinctive Colors to a Flame
28 Glass prism Spectroscopy cont.
29 Spectroscopy cont. Line spectra for H, Na, and Ne h=p://
30 The Periodic Table of the Elements
31 The Science of Life Spectra of life s chemical reactions Used to determine how enzymes work Used to identify pollutants emitted from automobile exhaust pipes
32 Technology Lasers Produce a beam of light
33 The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation. The emitted laser light is notable for its high degree of spatial and temporal coherence.
34 of a Laser
35 Lasers Have Many Uses
36 Periodic Table of the Elements Systematizes elements Columns contain similar elements Alkali metals: soft, silvery metals Noble gases: colorless, odorless, and inert
37 Periodic Table of the Elements
38 Why the Periodic Table Works: Electron Shells Patterns mirror arrangement of electrons in shells Pauli exclusion principle First shell 2 electrons, second shell 8, etc.
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