A DAY - Tonight’s HW

1. Do NOW A DAY - Tonight’s HW • Turn in your HW • Take back your cheat sheet • Grab a clicker and sit down! • Print out your study guide and bring it to class from now until Final Exam week. (All F.A.Q.’s are on there) • Anything that was not done in class today SHOULD BE worked on tonight! (You will have 45 minutes next class to finish) • You have an open notes quiz next class on everything from CH 27 - onward. (Monday) • Then, after the quiz, you will have the remainder of class time this school year to prep for final exam (MONDAY – WEDNESDAY – FRIDAY – I will not be here on Friday ) • Complete study guide, Quiz each other, Ask questions, etc. • Fill out cheat sheet – BOTH SIDES

2. Cheat Sheet (take a pic) • You are getting back your cheat sheet. • You can fill bothfront and back of this for the final exam. • If you would like a new cheat sheet, please sign your name on the clip board • I am not giving you formulas!!! • Suggestions to write on your cheat sheet: • Hints • Questions and answers • Formulas !!! • Sample problems

3. Schedule – A day (take a pic) • Thursday June 5th • Graded clicker DO NOW based on today’s POGIL • Finishing Ch 28, Color • Monday June 9th • ~45 minutes to review / wrap up today’s POGIL • Light & Color Quiz (Open Notes) • Time to prep for exam / review / work on cheat sheet (can fill out BOTH sides) • Wednesday June 11th & Friday June 13th* • Time to prep for exam / review / work on cheat sheet • Final Exam Study Guide is already posted on my website. It is YOUR RESPONSIBILITY to PRINT it out. Teacher will NOT make copies of this. *Mrs. Correia will not be here on Friday June 13th

4. Graded Clicker POGIL review • Last class’ POGILs out, clickers ready • Move to test seats / spread out / get dividers • This will be RAPID! You need to look at your answer for each # and buzz in. This should have been finished for HW, so there should not be a delay in answering. • No talking! Talking = 0%!!! • There are 10 questions. • Each is worth 2 points • Your grade will be out of 16 points (8 questions right) • Scoring 9 correct = 18/16; 10 correct = 20/16

5. #1-2 General Theme:What type of radiation is more dangerous / more likely to cause cancer? • Ionizing • Non ionizing • Equally as dangerous • Neither are dangerous

6. #3-6 General Theme:Our atmosphere blocks most cosmic radiation. But, you are exposed to more radiation in a plane, esp. towards the poles – why? • Atmosphere is thinner as you fly higher, and it is thinner at the poles than the equator, so there is less protection • Atmosphere is thinner as you fly higher, and it is thicker at the poles than the equator , so there is less protection • Atmosphere is thicker as you fly higher, and it is thinner at the poles than the equator , so there is less protection • Atmosphere is thicker as you fly higher, and it is thicker at the poles than the equator , so there is less protection • None of the above

7. #6. Explains why, a few years ago, pilots argued they should be allowed to bypass the body-imaging scanners at checkpoints. They are already exposed to so much radiation while flying for their career, and wanted to avoid additional exposure at security checkpoints.

8. #7-8-9Is glass transparent or opaque to visible light? Is glass transparent or opaque to infrared light? Is brick transparent or opaque to radio waves? • Transparent, transparent, transparent • Transparent, opaque, transparent • Transparent, transparent, opaque • Transparent, opaque, opaque • opaque, transparent, transparent • opaque, opaque, transparent • Opaque, opaque, opaque • None of the above

9. #10a. Glass is transparent to SOME TYPES of UV light, which explains why this truck driver has sun damage on the side of his face that was exposed to the driver’s window for all those years! Which type(s) of UV radiation is glass transparentto? • UVA • UVB • UVC • UVA & UVB • UVA & UVC • UVB & UVC • All 3 UVs • Not sure Remember – UVA causes skin aging (collagen breakdown!)

10. #10b. Which type(s) of UV radiation is glass opaqueto? • UVA • UVB • UVC • UVA & UVB • UVA & UVC • UVB & UVC • All 3 UVs • Not sure

11. #11. If glass is opaque to a certain EM wave, what happens to the energy from that wave? Does it disappear? • Yes – it disappears • No – it reflects & bounces back • No – it absorbs & turns into heat • None of the above explanations are correct

12. #12. Earth’s atmosphere does a pretty good job of protecting us from UV light. However, is it COMPLETELY OPAQUE to UV light? #13. You can get a sunburn if you are outside on a cloudy day. Are clouds transparent or opaque to UV light? • Yes, completely opaque; opaque • Yes, completely opaque; transparent • No, NOT completely opaque; opaque • No, NOT completely opaque; transparent

13. #14. If your beach umbrella is opaque to sunlight, then why do you sometimes get burnt on the beach even under the shade of an umbrella? #15. Why is light slower in transparent materials than in a vacuum? Takes time to interact with atoms in transparent materials (see 2nd bullet point in the box at the top of your POGIL page) • UV reflects… • off ocean, • Off sand, • etc.

14. 16. Short wavelengths of visible light interact more frequently with the atoms in glass than do longer wavelengths. Which do you suppose takes MORE time to get through the glass – blue light, or red light? Why? • Blue • Red • Same time • Not sure

15. 17. & 18 General Theme:Suppose sunlight is incident upon a pair of reading glasses and a pair of sunglasses. Which pair would you expect to be warmer, and why? • Sunglasses • Reading glasses • Same • Not sure

16. 17. & 18 General Theme:Both Tar and Sunglasses are Warmer! • The absorbed light energy cannot disappear • Instead, it turns into HEAT ENERGY!

17. #19 & 20 General Theme: What is the purpose of the lead vest you wear during X rays? • To protect you from unnecessary radiation – it is opaqueto X Ray radiation • To protect you from unnecessary radiation – it is translucent to X Ray radiation • To protect you from unnecessary radiation – it is transparent to X Ray radiation

18. #21 – 22 • Will vary based on what you do / where you live – go online to answer!

19. Light used to "see" an object must have a wavelength about the same size as or smaller than the object. #23: MOLECULES: X rays, gamma rays

20. Light used to "see" an object must have a wavelength about the same size as or smaller than the object. #24: PROTEINS: X rays, gamma rays

21. Light used to "see" an object must have a wavelength about the same size as or smaller than the object. #25: VIRUSES: X rays, gamma rays

22. #26. Why can't you use visible light to "see" any of the objects in #23-25? • Light used to "see" an object must have a wavelength about the same size as or smaller than the object. Visible light is BIGGER than those objects! You need UV light or smaller wavelengths!

23. ON Loose leaf, please create the following chart…..leave space to fill in!

24. POGIL • Work to the bell • Anything not finished must be finished 45 minutes into next class (so you MIGHT want to do some of this for HW) • Your goal upon POGIL completion should be to correctly EXPLAIN the demos you just saw. • You have an open notes quiz on Ch 27 and this Ch 28 POGIL next class. • You will have ~45minutes to review / wrap up at the start of next class, followed by the quiz.