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Think First

Get your calculator and log in. Think First. Follow the directions on the document being sent to you on the TI- nspire . There are 6 questions. Do not submit your answers. I will retrieve your answers at ________. Today’s Learning Target.

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Think First

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  1. Get your calculator and log in Think First Follow the directions on the document being sent to you on the TI-nspire. There are 6 questions. Do not submit your answers. I will retrieve your answers at ________.

  2. Today’s Learning Target I/We can make distinctions between light as a wave and light as a particle Vocabulary to know and use: frequency=ν (nu), wave length=λ (lambda), speed of light=c, quantum, Photon, Photoelectric effect, Planck’s constant, emission spectrum, electromagnetic spectrum

  3. Electromagnetic Spectrum • http://www.youtube.com/watch?v=kfS5Qn0wn2o Light as a wave and light as a particle http://www.khanacademy.org/science/cosmology-and-astronomy/v/introduction-to-light

  4. Write this in your composition book. c=λν Speed of light = c = 3.00 x 108 m/s Also written as 3.00 x 108 m s-1 Wavelength = λ = lambda = measurement from crest to crest = measured in nm or m (1 nm = 10-9 m) Frequency = ν = nu = one wave per second =1 Hz = 1/s = s-1

  5. (Copy this in your composition book) How to solve a problem: Ex. What is the wavelength of light that has a frequency of 5.77 x 1014 Hz? • What is the problem asking you to solve? Ex. wavelength • Write down what the problem gives to you (numerical values) and what they represent (units). Ex. 5.77 x 1014 Hz which is the frequency • Write the formula(s) needed to solve the problem. Ex. c=λν • Input the numerical values in the formula. Ex. 3.00x 108 ms-1 = λ. 5.77 x 1014 s-1 • Do the math and put a box around your answer. Include units. 3.00 x 108 ms-1/5.77 x 1014 s-1 = λ 5.19931 x 10-7m = λ 5.20 x 10-7 m = λ

  6. Write this in your composition book. Energy of a photon Equantum= hv Equantum= energy of a photon h = Planck’s constant = 6.626 x 10-34 J.s v = frequency J = joule = unit for energy s = second

  7. Calculating the energy of a photon • What is the energy of a photon of red light with a frequency of 4.30 x 1014 s-1?

  8. Five Activities • Do the following five activities: • Flame tests pg. 142; follow directions in book. There is one change: use an inoculating loop rather than a cotton swab. Answer all of the Analyze and Conclude questions. • Emission spectrum drawing: Choose a gas and draw it’s emission spectrum. Follow directions at this station. • Read pp.138-141 in the chemistry text and complete practice problems 15 and 116 on pg. 141 • Read pp. 142-144 in the chemistry text and complete practice problems 17-18 on pg. 144 • Create a Frayer Model in your composition book of light as a particle and light as a wave (see example on white board). 2. When you are done with all five show me your work to receive 25 lab points for your learning. 3. Complete as much as you can by the end of the period. Focus on the flame test 4. If you finish early, read pp. 144-148 in the chemistry text. Your homework is to finish any of the problems 15-18 in c and d above and the Frayer Model.

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