Presentation on theme: "Week #2 Q.4 (3/31) Homework: None Homework: None Activities/Assignments: Notebook Organization Acrostic Poem I.S. Learning Goal: I can analyze the factors."— Presentation transcript:
Week #2 Q.4 (3/31) Homework: None Homework: None Activities/Assignments: Notebook Organization Acrostic Poem I.S. Learning Goal: I can analyze the factors used to explain the origin and evolution of the universe. Warm Up: Briefly describe life cycle of a star. Fact: The Moon is moving away from the Earth 3.8cm every year.
Table of Contents for Quarter 4 IS Page Number Assignment 1Table of Contents 2Review of Space: How Big? How Far? How Old? 3Exploring Space Video handout 4Notes Life Cycle of Stars and Acrostic Poem 5Doppler Effect Notes 6Electromagnetic Spectrum ½ sheet 7Wavestown Handout 3
4 Use the words L I F E O F S T A R S Create a word or sentence explaining the words life of stars. *Must summarize the notes *Include a picture with color *Include 3-5 sentences explaining the Acrostic Poem Acrostic Poem or Name Poem Spelling out "fear"... F rightening E erie and strange A nxiety rises R eady to flee
Week #2 Q.4 (4/1) Homework: None Homework: None Activities/Assignments: Notebook Organization Notes on Doppler Effect Wavestown Activity I.S. Learning Goal: I can analyze the factors used to explain the origin and evolution of the universe. Warm Up: A black dwarf is a hypothetical end point of evolution for a degenerate star, either a white dwarf or a neutron star. What are your thoughts on this hypothesis? Fact: Astronauts cannot burp in space because there is no gravity in space to separate liquid from gas in their stomachs.
7 When we look at the Universe in a different "light", i.e. at "non- visible" wavelengths, we probe different kinds of physical conditions -- and we can see new kinds of objects! For example, high-energy gamma-ray and X-ray telescopes tend to see the most energetic dynamos in the cosmos, such as active galaxies, the remnants from massive dying stars, accretion of matter around black holes, and so forth. Visible light telescopes best probe light produced by stars. Longer-wavelength telescopes best probe dark, cool, obscured structures in the Universe: dusty star-forming regions, dark cold molecular clouds, the primordial radiation emitted by the formation of the Universe shortly after the Big Bang. Only through studying astronomical objects at many different wavelengths are astronomers able to piece together a coherent, comprehensive picture of how the Universe works!
8 Doppler effect was originally studied in the visible part of the electromagnetic spectrum. Today, the Doppler shift, as it is also known, applies to electromagnetic waves in all portions of the spectrum. Also, because of the inverse relationship between frequency and wavelength, we can describe the Doppler shift in terms of wavelength. Radiation is red shifted when its wavelength increases, and is blue shifted when its wavelength decreases. Astronomers use Doppler shifts to calculate precisely how fast stars and other astronomical objects move toward or away from Earth. For example the spectral lines emitted by hydrogen gas in distant galaxies is often observed to be considerably red shifted. The spectral line emission, normally found at a wavelength of 21 centimeters on Earth, might be observed at 21.1 centimeters instead. This 0.1 centimeter red shift would indicate that the gas is moving away from Earth at over 1,400 kilometers per second (over 880 miles per second).
The Doppler effect Originally discovered by the Austrian mathematician and physicist, Christian Doppler (1803-53), this change in pitch results from a shift in the frequency of the sound waves. Page 5
Doppler effect- The apparent change in wavelength of radiation caused by the relative motions of the source and observer Used to determine Direction of motion Increasing distance – wavelength is longer ("stretches") Decreasing distance – makes wavelength shorter ("compresses") Velocity – larger Doppler shifts indicate higher velocities The study of light Page 5
The electromagnetic radiation emitted by a moving object also exhibits the Doppler effect. The Doppler effect Blueshift: This spectrum shows hydrogen shifted to the blue end of the spectrum. This star is moving toward Earth. Redshift: This spectrum shows hydrogen shifted to the red end of the spectrum. This star is moving away from Earth. http://www.physorg.com/news200044818.html Page 5
The radiation emitted by an object moving toward an observer is squeezed; its frequency appears to increase and is therefore said to be blueshifted. In contrast, the radiation emitted by an object moving away is stretched or redshifted. Blueshifts and redshifts exhibited by stars, galaxies and gas clouds also indicate their motions with respect to the observer. The Doppler effect http://www.molebash.com/doppler/home.htm
Week #2 Q.4 (4/2&3) Homework: None Homework: None Activities/Assignments: Notes on Doppler Effect Wavestown Activity Astronomy video I.S. Learning Goal: I can analyze the factors used to explain the origin and evolution of the universe. Warm Up: What is the difference between red and blue shift in the Doppler effect. Fact: Saturn's rings are arguably the flattest structure known to man, being some 300,000 km end- to-end but with a vertical thickness of about 10 meters.
Table of Contents for Quarter 4 IS Page Number Assignment 1Table of Contents 2Review of Space: How Big? How Far? How Old? 3Exploring Space Video handout 4Notes Life Cycle of Stars and Acrostic Poem 5Doppler Effect Notes 6Electromagnetic Spectrum ½ sheet 7Wavestown Handout 14
Wavelengths Wavelengths can tell us A LOT about ENERGY ( traveling through the universe from a star ) –How powerful light is –How fast it is moving – Where it is moving from & to –What kind of light it is Doppler Effects: http://www.acs.psu.edu/drussell/Demos/d oppler/doppler.html http://www.acs.psu.edu/drussell/Demos/d oppler/doppler.html Sonic Boom http://www.youtube.com/watch?v=gWGL AAYdbbc http://www.physorg.com/news200044818.html
The Electromagnetic Spectrum WAVELENGTH: Distance from the top of one wave to the top of the next wave oEach form of radiation has a different wavelength o What does a radiation’s wavelength tell us? oHow powerful (how much energy) the radiation is oWhat kind of radiation it is
The Electromagnetic Spectrum Visible light: Red light = looooooooooooooongest, Violet light = shortest On the entire EM Spectrum, Radio waves : longest wavelength ~500 m (5 10 2 m) Visible light : middle ~.0000005 m (5 10 -7 m) Gamma rays : shortest wavelength ~.000000000005 m (5 10 -12 m) Brainpop: Color and EM Spectrum
Wavestown Worksheet What form of radiation is labeled on line #3? Is Infrared radiation more or less powerful than visible light? How do you know this? What’s so special about visible light? Let’s discuss 1 example from the picture of Wavestown of the different types of radiation… On the back, what is the relationship between wavelength & the energy of a form of radiation? Pg. 7: Secrets Held in Starlight Brainpop Video + Handout Into the universe with Stephen Hawking Story of Everything http://vimeo.com/17777145
Week #2 Q.4 (4/4) Homework: None Homework: None Activities/Assignments: Complete Astronomy video I.S. Learning Goal: I can analyze the factors used to explain the origin and evolution of the universe. Warm Up: + Reflection(turn in) Give an example of the sourse of Radio, visual and ultra violet waves on EM spectrum. Fact: The Sun burns 600 million tons of Hydrogen every second. The Cosmic Microwave Background that we detect today started traveling towards us over 13 billion years ago