Eraser shavings
They infest my white paper
A gust of wind, gone!
~Edgar F.
Laters!
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:
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.
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