Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Outer space wikipedia , lookup
Cosmic microwave background wikipedia , lookup
Main sequence wikipedia , lookup
Nuclear drip line wikipedia , lookup
Microplasma wikipedia , lookup
Astronomical spectroscopy wikipedia , lookup
Star formation wikipedia , lookup
Stellar evolution wikipedia , lookup
Unit Test 2 “Some “ Review Questions 1. Name the force of ATTRACTION between electrons and protons : ___________electromagnetism_____________________ 1. Gravity: Mass is attracted to Mass 2. Strong Force: the force between the protons and neutrons of the nucleus of atoms. It holds the nucleus together. 3. Weak Force: An attraction between hydrogen atoms. Causes nuclear fusion between hydrogen atoms, it is the reason the sun burns. It also causes radioactive decay. 4. Electromagnetism: Attraction between charged particles (e.g.protons & electrons). It is the force that holds atoms together. 2. State the law of conservation of energy: _____________energy neither created nor destroyed just transforms________________________________________________________ ________________________________________________________________ ___________________________________________________________ 3. List the first three elements formed in the beginning of the universe. Circle the simplest one:_________H He Li____________________________________________ 4.List the energy transfers and transformations below: 1 Transfers : __________wind ( KE) to propellar ( KE ) ________________________________________________________________ ______________________________________________________ Transformations : ___________wind to electricity ____potential to kinetic___________________________________________________________ ______________________________________________________ 5. Explain how galaxies form: • Clumps of dark matter attract Hydrogen and Helium gas through the force of gravity These clouds form huge clouds will eventually become galaxies 6. Explain how stars form : • • • A star is formed when a large amount of hydrogen gas starts to collapse on itself due to gravity. As the atoms collide they release a lot of heat energy. Eventually colliding nuclei hydrogen will fuse and form helium. This nuclear fusion causes a huge release of energy like a nuclear bomb. This nuclear fusion is what causes stars to burn . 7. Draw and label a lithium atom: Li : 3 e, 3 P, 4 N 2 8. Draw and explain the Doppler effect: Drawing: Red Blue 9. State the Big Bang theory: According to the Big Bang model, the Universe expanded from an extremely dense and hot state and continues to expand today 3 10. Put in the correct chronological order ( i.e which came first to last): big bang, first atom, solar system, life of earth, dinosaurs, humans 11. Explain how you can tell if something is going away from you in terms of the pitch of the sound and the color it changes: Red Blue 12. Since stars and galaxies are moving towards/away from each other this proves that the universe is shrinking/expanding. One effect that helps to explain this theory is called the violet/red shift and is further evidence for the ____big____ _____bang____ theory. 13. Explain the statement that humans came from stars: Big bang stared universe and stars responsible for first atoms and all other elements . Elements make life = humans 4 14. Which has more energy red light or blue light? Why? Blue = higher frequency = higher energy 5