Please copy this onto a separate piece of paper and turn in. Due tomorrow, November 18th.
1. Indicate whether or not these are valid units for speed.
A. yards/second^2
B. yards/second
C. meters/day
2. What are the standard international units of speed (SI units)?
Tuesday, November 17, 2009
Wednesday, October 28, 2009
Unit 4 Test: Quantum Physics
Today periods 1, 3 and 5 are taking the Unit 4 Test. The periods are 90 minutes long, so bring something to do for when you finish the test. I have lots of free books to read as well.
Tuesday, October 27, 2009
Unit 4 Review: Quantum Physics
Monday and Tuesday this week we are doing review problems for the unit 4 test, which will be on Wednesday, October 28 for periods 1, 3, and 5 and on Thursday, October 28 for periods 2 and 6. Periods 1, 3, and 5 will be 90 minutes long (see here), so when we're done with the test we'll go outside and hang in the sun (if there is sun) or play the Five Letter Word Game. If that doesn't appeal to you, bring something to do.
Here are the review questions (numbers taken from the blue Hewitt book):
2. What is a quantum? Give two examples.
3. What is a quantum of light called?
4. What is Planck's Constant, and how does it relate to the frequency and energy of a photon?
5. Which has more energy per photon - red light or blue light? Why?
6. What is the photoelectric effect?
11. As the speed of a particle increases, does its associated wavelength increase or decrease?
13. How does the energy of a photon compare with the difference in energy levels of the atom from which it is emitted?
20. Can the speeds and positions of electrons in an atom be measured with certainty?
21. What does it mean to say that a certain quantity is quantized?
23. A very bright source of red light has much more total energy than a dim source of blue light, but the red light does not eject electrons from a certain photosensitive surface. Why is this so?
24. Which photon has the most energy - one from infrared, visible, or ultraviolet light?
25. If a beam of red light and a beam of green light have exactly the same total amount of energy, which beam has the greater number of photons? Explain.
28. We do not notice the wavelength of moving matter in our ordinary experience. Is this because the wavelength is extraordinarily large or extraordinarily small?
A. What was Rutherford's gold experiment and why was it important?
B. Find the energy of a photon with frequency f=3x10^14 Hz.
C. Find the frequency of a photon with energy E=9 units.
Here are the review questions (numbers taken from the blue Hewitt book):
2. What is a quantum? Give two examples.
3. What is a quantum of light called?
4. What is Planck's Constant, and how does it relate to the frequency and energy of a photon?
5. Which has more energy per photon - red light or blue light? Why?
6. What is the photoelectric effect?
11. As the speed of a particle increases, does its associated wavelength increase or decrease?
13. How does the energy of a photon compare with the difference in energy levels of the atom from which it is emitted?
20. Can the speeds and positions of electrons in an atom be measured with certainty?
21. What does it mean to say that a certain quantity is quantized?
23. A very bright source of red light has much more total energy than a dim source of blue light, but the red light does not eject electrons from a certain photosensitive surface. Why is this so?
24. Which photon has the most energy - one from infrared, visible, or ultraviolet light?
25. If a beam of red light and a beam of green light have exactly the same total amount of energy, which beam has the greater number of photons? Explain.
28. We do not notice the wavelength of moving matter in our ordinary experience. Is this because the wavelength is extraordinarily large or extraordinarily small?
A. What was Rutherford's gold experiment and why was it important?
B. Find the energy of a photon with frequency f=3x10^14 Hz.
C. Find the frequency of a photon with energy E=9 units.
Friday, October 23, 2009
Lab: Spectra of Gases
Yesterday we learned that each element emits only certain frequencies of photons. Today we used that idea to identify two unknown gases. In this lab we observed ten different gases through a spectroscope an drew their spectras. I gave you the spectra of two unknown gases. Your job is to compare the spectra of the unknown gases to those you observed in the lab and identify the unknown gases.
This is due on Monday. To help you out, here is a great page with the emission spectra of all elements.
This is due on Monday. To help you out, here is a great page with the emission spectra of all elements.
Thursday, October 22, 2009
Photon Emission and Absorption
These are the notes from last year, but they will do until I get this year's up. These cover today AND yesterday.
Energy Levels
Energy Levels Continued
Homework:
Find the frequency of the photon emitted or absorbed when an electron:
1. "Falls" from E=15 to E=13. Was this photon emitted or absorbed?
2. "Jumps" from E=10 to E=15. Was this photon emitted or absorbed?
Remember that you can leave Planck's Constant as "h" if you wish.
Energy Levels
Energy Levels Continued
Homework:
Find the frequency of the photon emitted or absorbed when an electron:
1. "Falls" from E=15 to E=13. Was this photon emitted or absorbed?
2. "Jumps" from E=10 to E=15. Was this photon emitted or absorbed?
Remember that you can leave Planck's Constant as "h" if you wish.
Tuesday, October 20, 2009
Particles as Waves and the Heisenberg Uncertainty Principle
Again, these notes are from last year, but they'll do until I get this year's up.
deBroglie Wavelength
Heisenberg Uncertainty Principle
And here is the homework (ignore the repeats; that's for printing purposes):
HW: deBroglie Wavelength
deBroglie Wavelength
Heisenberg Uncertainty Principle
And here is the homework (ignore the repeats; that's for printing purposes):
HW: deBroglie Wavelength
Monday, October 19, 2009
Quanta
These notes are from last year, but they are basically what we did today.
Quanta
And here is the homework (ignore the repeats; that's just for printing purposes)
HW: Energy of a Photon
Quanta
And here is the homework (ignore the repeats; that's just for printing purposes)
HW: Energy of a Photon
Wednesday, October 14, 2009
History of the Model of the Atom
Many, many people have been (and are) involved in the development of models of the atom, but we're only going to talk about 6 developments.
Assigned: Create a time line of the historical development of models of the atom. Remember that a time line should be to scale!
Due: Atom Model assignment, Quarter 1 Crossword.
Assigned: Create a time line of the historical development of models of the atom. Remember that a time line should be to scale!
Due: Atom Model assignment, Quarter 1 Crossword.
Wednesday, October 7, 2009
Tuesday, September 8, 2009
Unit II Review Problems
We will have the test for Unit II: Light on Thursday, September 10th. Below are the review problems, which we will work on today and tomorrow. Please also count your purple stamps and wirte the number in your notebook scoresheet and on my scoresheet at school.
These problems are taken from the textbook. Remember, you are allowed to use your notebook on the test, so keep these problems in your notebook and check with your peers and with me to make sure your answers are correct!
p.419
7. Is the color spectrum simply a small segment of the electromagnetic spectrum? Defend your answer.
8. How do the frequencies of infrared, visible, and ultraviolet compare?
18. Distinguish between an umbra and a penumbra.
19. a. Distinguish between a solar eclipse and a lunar eclipse.
b. Which type of eclipse is dangerous to your eyes if viewed directly?
23. How do polarizing filters allow each eye to see separate images in the projection of three-dimensional slides or movies?
24. What evidence can you cite to support the idea that light can travel through a vacuum?
p.439
1. List the order of the colors in the color spectrum.
2. Are black and white real colors, in the sense that red and green are?
These problems are taken from the textbook. Remember, you are allowed to use your notebook on the test, so keep these problems in your notebook and check with your peers and with me to make sure your answers are correct!
p.419
7. Is the color spectrum simply a small segment of the electromagnetic spectrum? Defend your answer.
8. How do the frequencies of infrared, visible, and ultraviolet compare?
18. Distinguish between an umbra and a penumbra.
19. a. Distinguish between a solar eclipse and a lunar eclipse.
b. Which type of eclipse is dangerous to your eyes if viewed directly?
23. How do polarizing filters allow each eye to see separate images in the projection of three-dimensional slides or movies?
24. What evidence can you cite to support the idea that light can travel through a vacuum?
p.439
1. List the order of the colors in the color spectrum.
2. Are black and white real colors, in the sense that red and green are?
Friday, August 7, 2009
Friday, 8/7
Today we walked our way through a fire drill procedure and completed a worksheet for me to get to know you better. We also drew pictures on the back of that worksheet with our eyes closed.
Please bring a notebook on Monday. If you haven't already, please turn in your safety contract as soon as possible.
Have a great weekend!
Please bring a notebook on Monday. If you haven't already, please turn in your safety contract as soon as possible.
Have a great weekend!
Thursday, August 6, 2009
Welcome! Thursday, August 6th
Welcome back to school! I look forward to having you in my class. Today we passed out safety contracts and the syllabus. Please return the safety contract, signed by you and your parent or guardian, as soon as possible.
Please have a notebook for physics by Monday - I am recommending a three subject to get you through the whole year.
Please have a notebook for physics by Monday - I am recommending a three subject to get you through the whole year.
Wednesday, June 24, 2009
Wednesday, May 27, 2009
End of 2008-2009 School Year
Well, that's it my friends. Good luck to those graduating, and I hope to see the rest of you back next year. This blog will be pretty quiet until school starts up again, but I may post links or comics as I find them. Until then, let me leave you with my favorite student haiku of the semester:
Eraser shavings
They infest my white paper
A gust of wind, gone!
~Edgar F.
Laters!
Tuesday, May 26, 2009
Semester 2 Grades
If you wish to know your final semester grade, you can access your grades online through the Sunnyside District website. A link is provided to the right under "Useful Links."
And remember, if you ever want to know the price of fruit...just email me. miss.volkening@gmail.com
And remember, if you ever want to know the price of fruit...just email me. miss.volkening@gmail.com
Monday, May 18, 2009
Semester 2 Final Part One
Semester 2 Final Part One can be found at:
http://docs.google.com/Doc?id=dccgmhcd_60c2m22mdx
Notice that some problems refer to a diagram that is not visible. You will have to get that diagram from the class copies. You are allowed to use any resources you wish.
This is due by the scheduled final. There will be two more problems on the actual day of the final.
http://docs.google.com/Doc?id=dccgmhcd_60c2m22mdx
Notice that some problems refer to a diagram that is not visible. You will have to get that diagram from the class copies. You are allowed to use any resources you wish.
This is due by the scheduled final. There will be two more problems on the actual day of the final.
Friday, May 15, 2009
Thursday, May 14, 2009
Test 4 Review Part 2
Your fourth and last midterm test is tomorrow and covers electricity, electric circuits, quantum physics, and nuclear physics. Last week you were given the review problems for the electricity and electric circuits part of the test. Here is the rest.
Chapter 38
3. What is a quantum of light called?
6. What is the photoelectric effect?
20. Can the momenta and positions of electrons in an atom be measured with certainty?
21. What does it mean to say that a certain quantity is quantized?
24. Which photon has the most energy - one from infrared, visible, or ultraviolet light?
Chapter 39
30. What do different isotopes of a given element have in common? How are they different?
37. If a sample of radioactive material has a half-life of one week, how much of the original sample will be left at the end of the second week? The third week? The fourth week?
42. a. State the numbers of neutrons and protons in each of the following nuclei:
Li-6, C-14, Fe-56, Hg-201, and Pu-239 (Note: In the textbook these are written in the isotope format we learned in class, with the atomic number on the lower left and the atomic mass number on the upper left. I could not get the formatting correct to reproduce that here).
b. How many electrons will typically surround each of these nuclei?
45. What element results when radium-226 decays by alpha emission? What is the atomic mass of this element?
Chapter 40
2. What is the role of a neutron in nuclear fission?
4. Why does a chain reaction not occur in uranium ore?
Chapter 38
3. What is a quantum of light called?
6. What is the photoelectric effect?
20. Can the momenta and positions of electrons in an atom be measured with certainty?
21. What does it mean to say that a certain quantity is quantized?
24. Which photon has the most energy - one from infrared, visible, or ultraviolet light?
Chapter 39
30. What do different isotopes of a given element have in common? How are they different?
37. If a sample of radioactive material has a half-life of one week, how much of the original sample will be left at the end of the second week? The third week? The fourth week?
42. a. State the numbers of neutrons and protons in each of the following nuclei:
Li-6, C-14, Fe-56, Hg-201, and Pu-239 (Note: In the textbook these are written in the isotope format we learned in class, with the atomic number on the lower left and the atomic mass number on the upper left. I could not get the formatting correct to reproduce that here).
b. How many electrons will typically surround each of these nuclei?
45. What element results when radium-226 decays by alpha emission? What is the atomic mass of this element?
Chapter 40
2. What is the role of a neutron in nuclear fission?
4. Why does a chain reaction not occur in uranium ore?
Wednesday, May 13, 2009
Lab: Observing Alpha Particles in a Cloud Chamber
Today we used mini cloud chambers to observe alpha particles (mostly) leaving a piece of radioactive Fiestaware - there is uranium in the glaze.
Concept-Development 40-1 is due today.
Concept-Development 40-1 is due today.
Tuesday, May 12, 2009
Monday, May 11, 2009
Friday, May 8, 2009
Thursday, May 7, 2009
Electricity and Electric Circuits Review
You have your last midterm test next Friday, May 15. This test will cover electricity, electric circuits, quantum mechanics, and nuclear physics. It will be a longer test than usual. Today and tomorrow, you have time in class to get started on the review problems for the electricity and electric circuits part of the test.
Chapter 34 review problems
10. What is electric resistance?
11. Is electric resistance greater in a short fat wire or in a long thin wire?
22. From where do the electrons originate that flow in a typical electric circuit?
23. What is power?
28. Calculate the current in a toaster that has a heating element of 14 ohms when connected to a 120-V outlet.
36. Why are think wires rather than thin wires used to carry large currents?
48. Use the relationship power = current x voltage to find out how much current is drawn by a 120-watt hair dryer when it operates on 120 volts. Then use Ohm’s Law to find the resistance of the hair dryer.
Chapter 35 Review Problems
4. If three lamps are connected in series to a 6 volt battery, how many volts are impressed across each lamp?
6. If three lamps are connected in parallel to a 6 volt battery, how many volts are impressed across each lamp?
9. What happens to the total circuit resistance when more devices are added to a series circuit? To a parallel circuit?
10. What is the equivalent resistance of a pair of 8-ohm resistors in series? In parallel?
16. Calculate the current in a 48-V battery that powers a pair of 30-ohm resistors connected in series.
17. Calculate the current in a 48-V battery that powers a pair of 30-ohm resistors connected in parallel.
20. Why are household appliances almost never connected in series?
28. A 16-ohm loudspeaker and an 8-ohm loudspeaker are connected in parallel across the terminals of an amplifier. Assuming the speakers behave as resistors, calculate the equivalent resistance of the two speakers.
29. This uses a picture. See book.
30. How many 4 ohm resistors must be connected in parallel to create an equivalent resistance of 0.5 ohms?
31. This uses a picture. See book.
33. A 4-watt night light is plugged into a 120-volt circuit and operates continuously for a 31-day month.
a. How much current does it draw?
b. What is the resistance of its filament?
c. How much energy does it use in the month?
d. What is the cost of its operation for the month at the utility rate of 10 cents per kilowatt-hour?
Chapter 34 review problems
10. What is electric resistance?
11. Is electric resistance greater in a short fat wire or in a long thin wire?
22. From where do the electrons originate that flow in a typical electric circuit?
23. What is power?
28. Calculate the current in a toaster that has a heating element of 14 ohms when connected to a 120-V outlet.
36. Why are think wires rather than thin wires used to carry large currents?
48. Use the relationship power = current x voltage to find out how much current is drawn by a 120-watt hair dryer when it operates on 120 volts. Then use Ohm’s Law to find the resistance of the hair dryer.
Chapter 35 Review Problems
4. If three lamps are connected in series to a 6 volt battery, how many volts are impressed across each lamp?
6. If three lamps are connected in parallel to a 6 volt battery, how many volts are impressed across each lamp?
9. What happens to the total circuit resistance when more devices are added to a series circuit? To a parallel circuit?
10. What is the equivalent resistance of a pair of 8-ohm resistors in series? In parallel?
16. Calculate the current in a 48-V battery that powers a pair of 30-ohm resistors connected in series.
17. Calculate the current in a 48-V battery that powers a pair of 30-ohm resistors connected in parallel.
20. Why are household appliances almost never connected in series?
28. A 16-ohm loudspeaker and an 8-ohm loudspeaker are connected in parallel across the terminals of an amplifier. Assuming the speakers behave as resistors, calculate the equivalent resistance of the two speakers.
29. This uses a picture. See book.
30. How many 4 ohm resistors must be connected in parallel to create an equivalent resistance of 0.5 ohms?
31. This uses a picture. See book.
33. A 4-watt night light is plugged into a 120-volt circuit and operates continuously for a 31-day month.
a. How much current does it draw?
b. What is the resistance of its filament?
c. How much energy does it use in the month?
d. What is the cost of its operation for the month at the utility rate of 10 cents per kilowatt-hour?
Wednesday, May 6, 2009
Tuesday, May 5, 2009
Monday, May 4, 2009
Friday, May 1, 2009
Alpha and Beta Particles + Some Final Review
From now until the end of the semester, one bellwork problem per day will be a review problem that will likely appear on your final.
Thursday, April 30, 2009
Tuesday, April 28, 2009
Nuclear Physics
Today and tomorrow we will be taking notes on sections 1-5 of chapter 39. Concept Development 39-1 is also due at the end of the period tomorrow.
Monday, April 27, 2009
Thursday, April 23, 2009
Lab: Spectra of Gases
We are completing this lab today and tomorrow. Sorry sixth period; because of the assembly, you will not be able to finish. You will be excused.
Wednesday, April 22, 2009
Monday, April 20, 2009
Friday, April 10, 2009
Benjamin Franklin's Big Mistake
Remember when we were talking about current and the fact that the sign convention is backwards because Ben Franklin made a 50/50 choice and got it wrong? This was just posted by xkcd.com; awesomeness.
Have a great spring break!
Have a great spring break!
Wednesday, April 8, 2009
Compound Circuits
On Wednesday's bellwork we went over how to handle a compound circuit, then spent the rest of Wednesday and Thursday practicing on Concept-Development 35-2. This is due the day we are back from Spring Break.
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