Week 13 Nuclear Physics

WELCOME PHYSICS 9 SECOND SEMESTER Ms. Albarico

Week 13 Day 1 – Working Period Assessment D Day 2 – Half-life of Radioactive Decay Day 3 – Word problems about half-life radioactive decay Day 4 – Working Period Submission of Draft

Instructions 1) Get your laptop and work with your draft on your assessment D. 2)D  o self-evaluation on your essay when you are done. 3) Check if you have followed the correct formatting of your essay.

Check if your essay: ___ 1) Has a title and written bold, #14 size ___ 2) Contains at least 1500 words ___ 3) Body is written on #12 size font ___ 4) Double-spaced and all black ___ 5) Justified paragraph, first sentence indented. ___ 6) I checked the rubric again ___ 7) My essay contains everything I need to cover? ___ 8) Include citations on my essay ___ 9 ) Written all references ___ 10) My essay makes sense

Title (Short, catchy)   Introduction (Can start with an intriguing question, a quote, news, or anything that catches the audience. Also can add a definition of the main topic.   Body (This can be made of 4-6 paragraphs. It contains discussion, examples, comparison, contrast, and other important details of your essay. Should also include as well – background of the topic, different views about the main topic, advantages, disadvantages, and the importance of the topic in current application of Science and technology.)   Conclusion (Be as brief as you can but should contain the important details for summary.)   References (Must include at least 5-10 references. Use APA generator to cite references in APA style.)

7 - 8 The student is able to: ›  i. explain the ways in which science is applied and used to address a specific problem or issue ›  ii. discuss and evaluate the implications of using science and its application to solve a specific problem or issue, interacting with a factor ›  iii. consistently apply scientific language to communicate understanding clearly and precisely ›  iv. document sources completely.

1) Define the main idea or key term of the essay.! 2) Support with scientific reasoning by providing key concepts or laws.! 3) Compare and contrast.! 4) Give examples.! 5) Provide quotes from the articles(based from the references).! 6) Follow the formatting rules.! 7) Double check the rubric.! 8) Revise your essay as many time as you can.! 9) Submit a draft for revision.! 10) Read and revise for the last time before final submission.!

Feedback Feedback on submitted drafts: ›  Cite and refer to your references! No citations – means – PLAGIARIZED. Doesn’t mean that you write your references, you did not plagiarized. ›  Do not copy all phrases without citation. ›  Follow the template, don’t make your own! ›  Essay is not the same as journal/notes!

Feedback

Feedback

Feedback

16. Write the equation for the alpha decay of the following: Alph!a particle a) Uranium-234 ! !\"!#!! → !\" + !!\"# !\" b) Radon-222 !!!!\"!\" → Alph!a particle ! !\" + !!\"# !\" 17. Write the equation for the beta- decay of the following: Beta- particle anitineutrino Polonium-210 !\"!#\"!\" → !\"!#\"!\" + !!!! + !!! !\"# !Beta- particle !\" !! a)  !\" → !\" + ! + !b)  Thorium-234 !\"# !anitineutrino !\" ! 18. Write the equation for the beta+ decay of the following: Beta + neutrino a) Astatine-218 !\"!#\"!\" → !\"!#\"!\" + !!!! + !!!

decay 衰变 radioactivity 放射性 emits 发出 unstable 不不稳定的 disintegrate ⽡解 becquerel ⻉贝克勒勒尔 radioactive decay 放射性衰变

Rate of Decay Radioactive decay happens spontaneously (all by itself) and at random. There is no way of predicting when a particular nucleus will disintegrate, or in which direction a particle will be emitted. Also, the process is unaffected by pressure, temperature, or chemical change. However, some types of nucleus are more unstable than others and decay at a faster rate.

Rate of Decay The half-life of a radioactive isotope is the time taken for half the nuclei present in any given sample to decay. A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay.

Rate of Decay In a radioactive sample, the average number of disintegrations per second is called the activity. The SI unit of activity is the becquerel (Bq). An activity of, say, 100 Bq means that 100 nuclei are disintegrating per second.

Rate of Decay

Rate of Decay

Rate of Decay

Rate of Decay

Rate of Decay

Rate of Decay

Rate of Decay What is the half-life of element X if it takes 36 days to decay from 50 grams to 12.5 grams? 50 grams to 25 grams is one half-life. 25 grams to 12.5 grams is another half-life. So, for 50 grams to decay to 12.5 grams, two half-lives, which would take 36 days total, would need to pass. This means each half-life for element X is 18 days.

In your journal, answer questions 1 & 2 on page 253 on your textbook. Please refer to KotoBee Ebook for review.

Websites ›  https://www2.lbl.gov/abc/links.html ›  https://stfc.ukri.org/public-engagement/ activities-for-schools/nuclear-physics-for- you/nuclear-physics-resources/

Videos ›  https://www.khanacademy.org/science/ biology/chemistry--of-life/elements-and- atoms/v/introduction-to-the-atom ›  https://www.youtube.com/watch? v=LhveTGblGHY ›  https://www.youtube.com/watch? v=fwhjCw-IUu0 ›  https://www.youtube.com/watch? v=UtZw9jfIxXM

Simulations ›  https://phet.colorado.edu/sims/html/states- of-matter-basics/latest/states-of-matter- basics_en.html ›  https://phet.colorado.edu/sims/html/build- an-atom/latest/build-an-atom_en.html ›  https://pbslm-contrib.s3.amazonaws.com/ WGBH/arct15/SimBucket/Simulations/ chemthink-atomicstructure/content/ index.html

https://www.youtube.com/watch? v=8h1xWtZ_mI0