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Black Body Revisited!
Solutions of HW#2 and Tutorial #2
Under constructions.
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Please read chapter 24.1-4 and begin reading chapter 26.1-2.
Bring Redshift 2 CDROM to lab this week! Solution to HW#2. |
Announcements:
Tuesday lab: please pickup your labs at the end of class. Need for exam. If you set a meeting with me outside office hours: Send Email & Its verified once I Email back. (Several cases of misunderstandings) Monday: Help session, 7:30-9:30pm. If plans, come to 1st hour. Second hour answer questions. Observations: Very few people came to Wednesday Obs. lab, the best day so far! Remember 1/3 letter grade for missing ONE of the observation labs! (You may miss one afternoon lab without penalty, but that is not recommended either. We choose the best 7 out of 8). Afternoon labs: Only people that had Dean's excuse to miss afternoon lab the 1st two weeks of classes: Makeup labs next thursday, Feb 17, 7:00pm. Give back HW#2. Handins: Formulas page. (Will be attached to exam 1, but learn to use it). Regarding subject matter:
The reason is the following: We are following the scientific method more rigorously: First we gather all the evidence, then we try fit a theory that will explain what makes the stars "tick". Evidence gathering: Today: HW#2 correction to formulas & solutions. Note that we are "mopping up" the Stefan-Bolzman Law (I=sigma T^4), not covered in class before: (On board, the I vs color graph). Intensity is the power per area. I=P/A I, the intensity, is the power (Watts) per unit area (m2). I=constant T4
(the constant, named sigma, or s in the book pg. 366, is equal to 5.67 x 10-8 Watt / (m2 K4).) Everything else as in now corrected HW solution page. On board: Two spheres, Big and Little. For problems 2-4.
Coming up next: The HR diagram and lives of star. Why do we think stars
live turning a lot of m into E through
Which stars die young? How can one find stars that are just being born? What's in the "grave yard" of stars? Tutorial solutions. Click
here.
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