Waves…. Chapter 8nsl/Lectures/phys10062/Chapter 8... · 2013-02-19 ·...
Transcript of Waves…. Chapter 8nsl/Lectures/phys10062/Chapter 8... · 2013-02-19 ·...
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Waves…. Chapter 8
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Examination #1 Range was 0-109 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
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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
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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. Meteorite: A meteoroid that survives its passage through the Earth's atmosphere and impacts the Earth's surface.
h=p://www.universetoday.com/99950/watch-‐live-‐as-‐asteroid-‐2012-‐da14-‐whizzes-‐past-‐earth/
Washington Post
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Energy Transfer by Waves
• Wave – A traveling disturbance
• Properties of waves – Wavelength – Frequency – Velocity – Amplitude
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The Doppler Effect h=p://www.youtube.com/watch?v=ZRGg7e9b5wY&NR=1&feature=fvwp
h=p://www.youtube.com/watch?v=-‐d9A2oq1N38 Sonic Boom
h=p://youtu.be/4cCk1MXJHm0 Evidence that everything is moving away from us
An echocardiogram uses sound waves to produce images of your heart. This commonly used test allows your doctor to see how your heart is bea@ng and pumping blood. Your doctor can use the images from an echocardiogram to iden@fy various abnormali@es in the heart muscle and valves.
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The Electromagnetic Spectrum
h=p://www.youtube.com/watch?v=58fs5yI8K9I
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The Electromagnetic Spectrum
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Heat Escaping from People
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Visible Light
• Visible light – Range: 700nm–400nm
• Colors – Slices of electromagnetic spectrum
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A Glass Prism Separa@ng White Light
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Path of Light through the Human Eye
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Chapter 8
Great Idea: All of the matter around us is made of atoms, the
chemical building blocks of our world
The Atom
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Chapter Outline • The Smallest Pieces • The Structure of the Atom • When Matter Meets Light • The Periodic Table of the Elements
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Dividing a Bar of Gold
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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
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• Helium, carbon, aluminum, copper, gold
Everyday Elements
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The Structure of the Atom
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The Nuclear Regulatory Commission
• Logo: highly stylized atomic model
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Bohr Atom
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Electron Energy Levels
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Atomic Model
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Photons: Particles of Light • Photon absorbed – Used to move electron to a higher
energy state
• Photon emitted as electron moves to lower energy state
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Photons: Par@cles of Light
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Photons -‐ cont.
• Quantum leap or jump -electron disappears from original location and reappears in final location-never at positions in between
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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
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Na, K, and Li – Give Distinctive Colors to a Flame
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Spectroscopy – cont. • Glass
prism
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Spectroscopy – cont.
• Line spectra for H, Na, and Ne
h=p://www.youtube.com/watch?v=l4yg4HTm3uk
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The Periodic Table of the Elements
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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
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Technology
• Lasers – Produce a beam of light
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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.
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Ac@on of a Laser
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Lasers Have Many Uses
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Periodic Table of the Elements
• Systematizes elements • Columns contain similar elements – Alkali metals: soft, silvery metals – Noble gases: colorless, odorless, and inert
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Periodic Table of the Elements
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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.