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AP Physics 2 (Period 5) Assignments

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Assignment

Here's the spreadsheet that can be used to run the numbers on your RC Circuit Experiment on your own. Happy Summer!
 
My R1 and R2 in the spreadsheet are defined such that R3 is the resistance in series with the capacitance, and then R2 is the one in parallel with the combo of R3 and C.

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Assignment

6 Flags Magic Mountain Field Trip is Tuesday, May 28. Attending this trip is optional.
 
Students, to get cleared by your parents to go on this trip, you must direct them to this site:
 
 
where they will take action to clear you.
 
Students, once your parents have cleared you, to go on the trip, you must bring me the F-602 Form and payment (check payable to PVHS) together no later than Wednesday, May 22. The cost will be $85*. I will only accept the complete F-602 Form and the payment at the same time.
 
The trip is not officially happening until there are enough students to fill at least one bus. (Two are ordered.) If not enough students sign up to go, both buses get cancelled on May 22, and the checks are all returned to students/families to be destroyed. If there are enough students for one bus but not two, then one bus will be cancelled. Suppose the bus can only take 50 students, but 70 students get cleared, hand in their forms, and hand in their payment. In such an event, 50 students will go, and the other 20 will not. The 50 who go will be determined by First-Come-First-Served Priority. Priority for attending the trip will be given to the first 50 who got cleared (via the link above), handed in the F-602, and handed in the payment. This means that when students hand in the F-602 and check, I will put a number on the form with lowest number meaning earliest handed in. F-602 forms are available as hard copy directly from Mr. Warren and there is also an electronic version on the link above. (But the copy directly from Mr. Warren is preferable, because of information he wrote on it.)
 
*The $85 figure was arrived at from a calculated budget that I will share in class. For the trip to come in just under budget (meaning it will not be cancelled) there needs to be a minimum of 48 students signed up to go. (At 48 students, the projected cost comes out to $84.80 per student.)

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Final Exam is on Thursday May 2
 
Final Exam/AP Exam Study Tools:
 
The one named "Physics 2 MC Sample Exam" is the most modern.
 
The old AP Physics B multiple choices I give here are pretty useful. The compiled document was an effort to condense questions from the other years into one file that has less mechanics. But mechanics isn't bad.
 
Instructions for Free Response Practicing:
 
1. Go to this site:
 
2. Pick a year. Open the file. Do the full test by yourself, undistracted, IN TEST-LIKE CONDITIONS. Set a time-limit. Write the solutions out as if a stranger were going to grade them for quality work-showing.
 
3. Sometime soon after taking the test, open the Scoring Guidelines. Use the rubric to score how you did.
 
4. Do two such years BEFORE the end of the week that ends on 4/26. And do at least one of the multiple choice mock tests I provide. From this, make a list of topics you want me to refresh.
 
It's a mistake to wait until after 4/26 to engage in the processes above.

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Assignment

Proto-Practice AP: These are old AP Physics B MC exam questions compiled into a file.
 
Answers to the attached file:
 
1. c
2. a
3. c
4. c
5. b
6. a
7. c
8. e
9. c
10. a
11. d
12. c
13. e
14. e
15. a
16. a
17. b
18. e
19. d
20. d
21. e
22. d
23. d
24. c
25. d
26. a
27. e
28. A
29. d
30.

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A Draft of a Topic Outline for the year, prior to final exam and AP exam reviewing.

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Photoelectric Effect Items need to be done before March 25. Items plural, because read your textbook, the section called "The Photoelectric Effect". The attached file has your name in it, with items to respond to, using the PhET simulator site.
 
When you use the site, click "Show only the highest energy electrons." Also, I found a better way to get the stopping potential. But it's not in the directions yet. It involves using the current meter.
 
The other two attachments are more generally about Quantum Physics

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Guidance for the full simplified Bohr proof for hydrogen's principle orbitals.

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Assignment

Link to those PhET simulations on wave interference:
 

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Assignment

Due Tuesday 3/19: The following was instructed in class. You're expected to record your best results when you know you're done (and why should I have to say that.)
 
1) You open the attached "Balmer versus Paschen Discovery" file.
You fill in the wavelengths as measured by the class. 3 are needed. People said they would agree to contact their friends to know the value of the two wavelengths that they didn't measure. Every individual should be personally responsible for one of the three (having measured it and calculated it) and obtaining the other two from other groups. If people who nodded in class were lying to me and are NOT willing to obtain the other two wavelengths from other people, then those people will be expected to use their own single one that they measured and then the other two from the fake example described below in instruction step 2. (The numbers in the fake example are not accurate, so don't copy them. They will give inaccurate results. They are here to provide an example of my instructions.)
Labeling in the spreadsheet makes it obvious which column to put the wavelengths into. And I labeled most of the other columns with "Ignore" and I mean that. Only the wavelength column and Column A of the spreadsheet will be used in this homework. To see how to use Column A, read instruction step 2.
 
2) You use the spreadsheet to best guess which set of 3 successive integers in column A best gives a line pattern when the reciprocal of lamba is plotted versus the reciprocal of the square of n. The manipulated graph gets automatically made when the wavelengths are put in and the 3 successive integers are guessed. (If you don't see the graph automatically change in front of your, then the spreadsheet isn't working right.) For example, entries for the three rows in column A could be 10, 9, and 8 in that order. Open the attached example file to see what I mean. It's the one that has word Example in the title. When you open it, you will see that someone has input the three wavelengths of 700 nm, 460 nm, and 420 nm. (In the example, these would have been the class labgroup best results (but in real life, they're not great results, pretty inaccurate.)). After inputting the three wavelengths, the scientist has guessed that the three consecutive integers 10, 9, and 8 should go in Column A. The quality of this guess will be judged by how high quality a line is formed from the three data points that result on the maniuplated graph. By now, you are supposed to have looked at the graph to see how it came out. Not great, but what do you have to compare it to? Make changes to find out, as instruction step 3 describes.
 
3) So now, in the example file, change the guesses in Column A to 8, 9, and 10. Do it. Watch the graph automatically change. The linearity of the graph did improve, but I'll bet it could be better still. So now try a different set of three consecutive integers.
 
4) Consider the homework done when you find the best set of three consecutive integers that make a linear pattern when inverse of lamba is plotted versus the inverse square of n. But do it with the non-example file, and use actual class measured wavelengths as measured on March 13 and 15, 2019.

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Assignment

Answers to the three in-class interference problems of 3/7/19 and 3/11/19. CORRECTION: #1 has to be based on a wavelength shift for red in glass.
 
1. 233.3 nm is the right answer. (The good wrong answer was 350 nm.)
2. 53 degrees
3. 653 nm
 
The last answer was based on people saying they saw a signal at y = 11 cm. The problem was originally fabricated with a fake hypothetical y of 12 cm. With the 12 cm y, the answer would have been 704 nm. If that signal were observed, we'd have needed an infrared detector, but when I first made up the problem, I only considered it hypothetical. Notice that the wavelength went a little shorter when y got a little less. In this color spread, longer wavelengths are MORE displaced, whereas in a rainbow caused by dispersion (prisms), the longer wavelengths are less displaced.
 
#2 requires a longer solution document. I'll post one as soon as I can. Something interesting about its solution: It occurs at a shift of 2 wavelengths, because a shift of one wavelength was proven impossible by the geometry of the scenario.

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Assignment

Optics Test March 1
 
Practice Test Answers!
 
You still need a few. Here are some from the latter part of Optics Practice:
 
11. 1.67
12. If that bent part on the right were bent down 20 degrees from horizontal, it can be shown that light will encounter the surface at 17 degrees relative to the normal. In such a case, refraction will occur because there will no total internal reflection, and the light will emerge with an angle of 29.2 degrees relative to the normal.
14. Upright, p = 24 m, M = +0.25, and what's happening is that q is getting close to f in this one. That's what happens when p is relatively large, as it is in this case.
15. Only diverging lenses make shrunken virtual images, and that's all they do, so all trees are upright. Because all upright images are virtual. M = +0.6, f = - 15 cm, Image is 0.9 cm wide.
The other answers have to be drawn in class.
 
Attached are the electronic copies of the practice test documents I passed out in class on 2/27/19.
 
The hard copy of the answer document I handed out had a labeling error. It has a solution outline for one of the questions and refers to it as #7 from the first part. That was supposed to say #8 from the first part.

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Assignment

Correction. I goofed some algebra on the board late in class on Tuesday 2/19.
 
The problem was: Predict theoretical magnification for a scenario when an object is located at 1.5f from a converging lens. I solved as follows:
 
M = f/(f - p) = 1.5f/(f - 1.5f) = - 1.5/0.5 = - 3              THAT had a substitution error.
 
The solution with no errors is:
 
M = f/(f - p) = f/(f - 1.5f) = - 1/0.5 = - 2
 
My ray diagram had a magnification of -2.15.

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Assignment

Reminder: What to know heading into Tuesday Feb. 19:
 
I said to complete your summary knowledge of the following by the time you come to class on Tuesday Feb. 19. Know the answers to each of the 14 questions below:
 
M1) Which of the four unique spherical mirror setups* lead to an image that is inverted?
 
* A "spherical mirror setup" means where is the object set in relation to the glass, the point F, and the point that is the center of the circle. There are 4 possibilities: A) p < f on the concave side. B) f < p < 2f on the concave side, C) 2f < p on the concave side, D) p on the convex side.
 
M2) Which of the four unique spherical mirror setups* lead to an image that is non-inverted?
M3) Which of the four unique spherical mirror setups* lead to an image that is real?
M4) Which of the four unique spherical mirror setups* lead to an image that is virtual?
M5) Which of the four unique spherical mirror setups* lead to an image that is enlarged?
M6) Which of the four unique spherical mirror setups* lead to an image that is diminished?
M7) Are any pairs of answers above always the same?
 
Good news, now we turn to thin spherically-based lenses. And every pattern in the spherical mirrors has a one-to-one counterpart in the thin spherically-based lenses. So for thin spherically-based lenses, the questions whose answers to know are:
 
L1) Which of the four unique lens setups* lead to an image that is inverted?
 
* A "lens setup" means where is the object set in relation to the glass, the point F, and the point F2 that is located 2f from the center axis of the glass. There are 4 possibilities: A) p < f near a convex lens. B) f < p < 2f near a convex lens, C) 2f < p near a convex lens, D) p being any distance from a concave lens.
 
L2) Which of the four unique lens setups* lead to an image that is non-inverted?
L3) Which of the four unique lens setups* lead to an image that is real?
L4) Which of the four unique lens setups* lead to an image that is virtual?
L5) Which of the four unique lens setups* lead to an image that is enlarged?
L6) Which of the four unique lens setups* lead to an image that is diminished?
L7) Are any pairs of answers above always the same?
 
A careful look at the excellent ray tracing diagrams in the book answers all of the questions above. Please know all of it. It's what I said to do last class. I fully described the assigned task thoroughly in class, and I said I'd give you a written list as well, which is what this posting has done.
 
Deeper knowledge beyond what's above. Know how to perform proofs using algebra that answer each of the above. I didn't say you had to have algebraic proofs mastered by the start of class on 2/19. I just said you had to know the facts that answer the above questions.
 
More deeper knowledge: know how to do all ray tracing that answers everything above. I didn't say you had to have all ray tracing mastered by the start of class on 2/19. I just said you had to know the facts that answer the above questions. (If you are caught up, you can do all mirror ray tracing, but maybe not all lens ray tracing.)
 
And finally, you might wonder, "What about the question of image location as a question to answer above: is the image closer to the glass than object or farther?" Do you see that that question is now answered by M5, M6, L5, and L6, and therefore is not unique? This is because M = -q/p. This means the absolute value of magnification will tell you how q's magnitude compares to p's. Answering that is the same thing as answering "Is the image closer to the glass than object or farther?"
 

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Assignment

Topics from February 7 through February 21: Chapters 22 and 23
The name is Geometric Optics
 
Chapter 22 Problems will be the odd ones from 7 through 55 in the back of the chapter.
Chapter 23 Problems will be the odd ones from 1 through 45 in the back of the chapter.
 
Schedule: to have Chapter 22 understood by the end of Thursday 2/14.
To have Chapter 23 understood by the end of Thursday 2/21.
 
Please read the text early. This set of material is readily learnable from the book, and the textbook is very clear. That doesn't mean I won't teach it as well. Classtime will have a lot of labwork, so the textbook part has to be at home.

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Reminder: You have to come to class with a ray diagram. One that shows rays encountering a spherical concave mirror and whose image point (intersection point) can explain the projection trick that I did on the inside of the door in the classroom.
 
Anyone unsure of what to do for this: Just copy the procedure out of Chapter 23 in the textbook.
 
If you need a spherical template to help with this, I've attached a pretty nice one here. By reading the book, you should be able to adapt it to the assigned task above.

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Know fully what's in this (after where it says START) by Thursday 2/7.

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Reading Reminder:
 
To read Chapter 21, Pages 707 and onward. Memorize the categories of the electromagnetic spectrum in order of increasing frequency (or shortening wavelength).

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Final Exam grade calculation instructions