Wright State University Lake Campus/2016-1/Phy1060/log

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Today we talked about parallax.

3/8

Today we did a lab on energy, temperature and blackbodies.

Dailly journal

1/11 Monday

1/13 wed

Copy this into your user page and paste: *[[Wright State University Lake Campus/2016-1/Phy1060]]

1/19 tues

Important announcement

Tuesday's and Thursdays are lab days and I need to take attendance. Usually this will be in the form of a 1-page report on blank typing paper. Leave a 3/4 inch margin all around and do not include your real identity inside that space.

You need to follow the aforementioned instructions so that I can give you a good lab grade

1/22 Fri

ques 8 Wikipedia_Sidereus_Nuncius

2/1 Mon: What to put in your dot-S sublog


==Work accomplished==
<small>Describe each contribution, list date and permalink.  Use either # or * to create a list.</small>
==Lab journal==
<small>Only for labs, which occur on Tuesdays and Thursdays.  A one sentence (with or without verb) is all you really need.  (But it would be good practice to write a bit more).</small>
  • I will be monitoring your efforts to give you an idea of when you have completed this minimum effort.
  • An extraordinary effort that truly helps Wikiversity or Wikipedia could get you an A even with mediocre test scores. I strongly suggest that if this is the path you choose to take, that you stay in close contact with me as I oversee your work to make sure you are not getting into trouble.

2/4 Thur

I might be a few minutes late today. Go to Second Journal of Science and write a handwritten summary of Wikipedia:Astronomical spectroscopy. Don't write it in your .S log, but on actual paper. You may work in groups, but each person needs a different summary.

2/11 Thur

  1. If you have not already done so, today you must go to your .S subpage and create a work accomplished page for all You may copy the following script:

==Work accomplished==

  1. The entire class will write a description of the parallax experiment. You may write in your .S journal if you prefer to work alone, or you may work in groups of 2 or 3 and write on a white sheet of paper. If you write in the .S journal, sign your username to the sheet provided.
  2. Now divide up into two groups and "stage" the lab so we can take pictures. Pick one of the two activities. The photographers will meet with me as the "actors and directors" prepare for the photography.
  • Physics and Astronomy Labs/Parallax. Our first goal will be to photograph students setting this lab up and writing a description of the lab. Write your descriptions using pencil on a piece of paper. You may work in groups of 1, 2 or 3 as you write. Then form groups of 3,4, or 5 to "stage" the setting up of the lab for a photograph.
  • Physics and Astronomy Labs/Hooke's law and Young's modulus. Here, you will document how we wind and unwind the string, and how we measure the force using a spring scale.


2/23 Tues: Angular size to find distance to wall

Physics_and_Astronomy_Labs/Distance_and_angular_size

2/23 Thur: Parallax

Physics and Astronomy Labs/Parallax

3/8 Tues: Black body using Nebraska materials

Astronomy_education_at_the_University_of_Nebraska-Lincoln#Blackbody

3/22 Tues: Nebraska HR diagram (help with the upcoming exam

What happens when one moves vertically on the HR diagram? How do low mass stars change during "birth"?

3/23 Wed: More help with exam

1. Small clusters have less gravity; they "evaporate". Random motion causes these stars to interact and some of them gain enough speed to escape from the gravity.
2. Nearby clouds exert gravitational forces. It is FALSE to say the feel significant forces only due to gravitational forces with each other. But they do feel significant attractions due to giant molecular clouds. These clouds are very dense and massive.
3. The moving cluster method can be used to find distance: Over a few years, the evaporation is effectively zero, so the cluster does not change its size. But the angular size does change, and they can use math to calculate the distance using the doppler effect for speed and the change in angular diameter due to the fact that the object is moving away from them. Hint: A distant object that is moving away at high speeds does not change its angular size very rapidly.


3/24 more help with exam

Einstein was bothered by quantum mechanics because it predited that the "possibility" that the electron went through the top hole would interfere with the possiblity that the electron passes through the other hole, creating a spooky action at a distance that was ultimately verified with Bell's theorem.
1. location on the HR diagram: temperature-Luminosity (Hot star that is dim, since hot stars give off much energy per square foot, they must have very few square feet: About the temperature of the sun, but only about the size of the earth. See File:H-r diagram-black white.png and File:Hertzsprung-Russel_StarData.png.
2. The spectral lines are red shifted (Gravitational NOT Doppler). We know the white dwarf is not moving away from us because it is orbiting another star that is not moving away at high speed. What else could cause this shift? General relativity and the idea of photons (Einstein). See File:Gravitational_red-shifting2.png and File:Redshift blueshift.svg
3. The quantum theory of solids says that the electrons prevent further collapse -- believe it or not, the same theory that explains the density of metals also describwes the density of a white dwarf. See the image at w:Bohr–Einstein debates#Post-revolution:_First_stage as well as File:Nuvola di elettroni.svg and and file:H2OrbitalsAnimation.gif

3/30 Wednesday

Finish the story of the white dwarf with Quantum theory of solids.

3/31 Thursday

Links

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