AST 120 SPACE SCIENCE I

+ BE SURE TO UNDERSTAND HOW TO DO THE in class Problem S1: What is the Frequency of a green photon whose Wavelength Is = 500 nm? How much energy does it contain?

PART B: HW Read/study sec 2-3 Problems 2.13(HW33 ),2.14(HW34 ),2.18(HW 35)

PART D Read/study 2.5-2.7 Problems 2.4(HW37 ),2.24(HW 38),2.26(HW39 ),2.29(HW40 )

•Also study page 19 of text for Parallax •derivation and do the following important problem

HW41: The Distance Modulus ( other forms of the same equation as the text) derive each of the following?)

m_V – M_V= -5 + 5 log₁₀(d [pc])

_{d =} ₁₀^(m_V^{– M}_V^{+ 5)/5} _pc

Assignment #5:

Part A: Read/study Chap 3 to 3.2

Questions 3.1(HW42),3.6(HW43)(these are not in the Problems section!)

SP 1 (HW44)Check on the web for stellar spectra then do Question 3.2

Sp 2 (HW45)Looking over the table "Abundances of the elements" in appendix G

A. how many times more abundant is Helium than sodium. (ie relative ratio).

B. In general what can be said of the abundances of elements heavier than iron.

C. Calculate the ration of iron to Uranium, iron to carbon and iron to iodine.

D. Does your values in C support what you said in B. Yes or no. Why?

Sp3(HW46). Check on the web for a periodic table. What do you expect the formula for the combination of Potassium(K) and Sulfur (S) to be?

Also the formula for Lithium (Li) to Flouride (F)?

PART B: Read/study section 3.3

Problems 3.1(HW47),3.2(HW48),3.3(HW49),3.5(HW50),3.9(HW51)

SP 4 (HW52): Do Example 3.1 calculation for the first Balmer line…

what color is this line?

As stated in lectures

Using mv² = e²/r and mvr = nh / 2p eliminate V gives

r = n² h² / 4 p²me² = r_n to indicate n dependence = eq. 3.5\

SP 5(HW53): Do this last derivation (the algebra)

Then do the books derivation for comparison!

SP 6(HW54). do EXAMPLE 3.2

SP 7(HW55). 1/l = R(1/m²-1/n²) which we see is the Balmer formula is Eq 3.8

derive this equation 3.8 from the analysis using Eq. 3.7b

PART C: Read/study section 3.4

Questions 3.9(HW56),3.10(HW57),3.11(HW58)

Problem 3.10(HW59)

PART D; Read/study section 3.5

Questions 3.12(HW60), 3.13(HW61), 3.14(HW62)

Problems 3.17(HW63), 3.18(HW64), 3.19(HW65)

(HW66) Do example 3.3

Assignment #:6

Stellar masses

Readings to follow in the HW's will be in sections 5.1-5.3

read 5.1,5.2 and look over key elements of 5.3
Study carefully examples 5.1,5.2 (solar mass defined!)
Questions: 5.3(HW67), 5.7(HW68)
Problems 5.1(HW69), 5.3(HW70), 5.6(HW71)
EXTRA CREDITS: 1. Derive Equation 5.20
2. if we cannot see both stars
how do we get R?

STOP here for this section

Assignment

LABORATORY EXERCISE: Print up for the first session this week the Star Finder (this link) exercise and bring to class

FOR the NEXT week lab session (week 2): Look over and study the exercise math review found via this link.

LABORATORY EXERCISE: Print up for this week the math review (this link) exercise and bring to class

FOR the NEXT week lab session (week 3): Look over and study the exercise found via this link. math with excel

LABORATORY EXERCISE: Print up for this week the math with excel (this link) exercise and bring to class

FOR the NEXT week lab session (week 4): Look over and study the exercise Blackbody Spectra found via this link.

FOR the NEXT week lab session (week 5): Go to CLEA WEBSITE and print up the student manual for the "Photoelectric Photometry of the Pleiades" exercise, READ THE INTRODUCTORY MATERIAL and bring to class next week lab session. Directly ACCESS by image link

6 Forensic Atomic Structure (obtain here Forensic Atomic Structure ) How do we identify element here and elsewhere in the universe will be explored. To Identify elements you will use the Chart and the link Spectra of Gas Discharges.mht at this link you can click on a spectra to get a better resolution to see the actual wavelengths. Units are in Angstrom so divide by 10 to get nanometers. .

Astronomy: A Physical Perspective 2nd Edition

Marc L. Kutner University of Texas, Austin ISBN-10: 0521529271 Cambridge University Press