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Homework questions?

This homework assignment explores the concept of electron configuration and the duality of light. It discusses the contributions of various scientists, such as James Chadwick and Niels Bohr, and explains the relationship between wavelength, frequency, and energy of light. Students will engage in a hands-on activity and complete an eye exam to reinforce their understanding of these concepts.

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Homework questions?

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  1. Homework questions?

  2. Electron configuration 3.3

  3. Objectives • Modify our understanding of the atomic model, specifically the position of electrons. • Discuss scientists that contributed to this knowledge. • Explain the duality of light.

  4. 3.2 Loose ends: • James Chadwick discovered the neutron • Coulomb’s Law: Closer two charges are to each other, more force between them • (Opposites attract, likes repel … Protons need neutrons)

  5. Rutherford’s electrons

  6. Niels Bohr 1913 • Electrons only allowed at discrete distances from nucleus

  7. Terms • Orbital – region around a nucleus • Cloud – blurry boundaries

  8. Louis de Broglie 1924

  9. So… What is light?

  10. Light is waves of energy THIS IS THE PORTION OF LIGHT YOU SEE

  11. Not all light is visible http://science.howstuffworks.com/light3.htm

  12. Continuous strokes or points of paint? http://www.lightandmatter.com/html_books/6mr/ch03/ch03.html

  13. Light is also particles of energy

  14. Longer wavelength – less energy / photon Shorter wavelength – more energy / photon

  15. Emission of energy by atoms http://www.onlineneonsigns.com/misc_beersigns/oldstylewalkingcubs.jpg http://chemijunior.com/notes/09tests/tests.htm http://www.angelo.edu/faculty/kboudrea/demos/magic_show_2008_fall/colored_flames_02.jpg http://www.myneonhaven.com/images/neons/9c_1.jpg

  16. Wavelength: Distance from peak to peak (or valley to valley)

  17. Frequency: How many peaks pass a given point in a period of time

  18. Inactivate your text book! • With your partner, draw three waves • One with wavelength X • One with wavelength 2X • One with wavelength 4X • Rank from highest to lowest frequency • Rank from highest to lowest energy • Explain both answers in your notebook

  19. Frequency and Wavelength Wavelength () = Speed ( ) / Frequency (f)  =  / f

  20. Wavelength and Frequency are inversely related Energy and Frequency are directly related

  21. And one last test … an eye exam

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