1 / 27

A Day in the Life of a Wave

A Day in the Life of a Wave. What Waves Can Do. Some Wave Vocab. Wave – a way to transmit energy without carrying mass Medium (noun) – The material that a wave passes through (Ex: air, water, tabletop). Waves are exciting creatures full of possibilities….

dagan
Download Presentation

A Day in the Life of a Wave

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Day in the Life of a Wave What Waves Can Do

  2. Some Wave Vocab Wave – a way to transmit energy without carrying mass Medium (noun) – The material that a wave passes through (Ex: air, water, tabletop)

  3. Waves are exciting creatures full of possibilities… When waves strike a surface of a different material, 3 things can happen: • Some of the waves can be absorbed. • Some of the waves can be reflected. • Some of the waves can be transmitted.

  4. 1. Absorption • New material absorbs energy of wave and its temperature increases slightly • Wave dies 

  5. 2. Reflection • Maximized when wave strikes a new medium of very different density (ex – light traveling in air strikes a mirror)

  6. Angle of Reflection • Draw a line perpendicular to the boundary between two media. This line is called a normal.

  7. Angle of Reflection (cont.) • An incident wave forms an angle with the normal. This angle is called the angle of incidence. • The reflected wave will form an angle on the other side of the normal. This is called the angle of reflection.

  8. Angle of Reflection (cont.) • The angle of reflection will always be equal in size to the angle of incidence. An example

  9. 3. Transmission • When a transmitted wave enters a new medium, its path is bent from the path of the incident wave. This bending process as a wave enters a new medium is called refraction. A Familiar Example

  10. Refraction Examples

  11. A Summary of Wave Behavior Thus Far • Absorption – Wave is absorbed by surface and “removed from play” • Reflection – Wave “bounces” back • Transmission – A wave passes through a boundary, bending (refracting) as it goes

  12. Why is This Important?

  13. The Deepest Hole:Kola Superdeep Borehole, Russia • Reached a depth of 40,230 feet (nearly 8 miles) • Took 29 years • Temperatures at bottom were a toasty 356oF

  14. Even 8 Miles is Just the Tip of the Iceberg Depth of Superdeep Borehole Radius of Earth (6,370 km) Another Way???

  15. A Review of Seismic Waves P Waves • Longitudinal (push-pull) waves • Travel faster • Can travel through solids and liquids S • Transverse (up-down) waves • Travel slower • Can only travel through solids (not liquids)

  16. A Break from our Slideshow

  17. What We Know About the Earth(Thank the wave, not me) • Earth has layers!

  18. Core Mantle Crust Layers Based on Composition

  19. Continental Crust ~ 40 km thick (8-75km) Mainly igneous rock (granite) Up to 4 billion years old Density = 2.7 g/cm3 Ocean Crust ~ 7 km thick Mainly igneous rock (basalt and gabbro) 180 million years old or younger Density = 3.0 g/cm3 The Crust

  20. The Mantle • Over 82% of Earth’s volume! • ~2800 km thick • What’s different from crust? Mainly type of rock (peridotite) • Density = 3.4 g/cm3

  21. The Core • Made of iron and nickel • Density = 13 g/cm3 (Ouch!)

  22. BUT Can Also Layer Earth Based on Physical Properties

  23. Lithosphere • Outermost layer • Consists of crust and upper mantle • Cool and crusty • About 100 km thick

  24. Athenosphere • ~ 600 km thick • Part of upper mantle • Rocks near melting point, so easily deformed: kinda soft and squishy

  25. Lower Mantle • ~2200 km thick • More rigid than athenosphere • But rocks still very hot and able to “flow”

  26. Outer Core • ~ 2300 km thick • Liquid iron and nickel • Spins and creates Earth’s magnetic field

  27. Inner Core • ~ 1200 km thick • Solid iron and nickel, baby! (Under a LOT of pressure)

More Related