PHYS-333-13s: Problem set #2
Solutions
Version of February 23, 2013.
1. Visual binary (15 points):
Over a period of 10 years, two stars separated by an angle of 1 arcsec are observed to
move through a
PHYS-333: Problem set #1
Solutions
VERSION of February 12, 2013 .
1. Energy ux and magnitude:
a. Suppose two objects have energy uxes of f and f + f , where f
f . Derive
an approximate expression for
Phys333-13s HW7 Solutions
#1 Application of Tully-Fisher relation
z = 0.23;
Dl = 0.0013;
mI = + 17.6;
c = 3 10 ^ 5 km s ;
a. Orbital velocity Vrot
Vrot = c * Dl 2; H* Doppler width is from 2*Vrot,
so
PHYS-333: Fundamentals of Astrophysics
Stan Owocki
Department of Physics & Astronomy, University of Delaware, Newark, DE 19716
Version of October 26, 2013
I. STELLAR PROPERTIES
Contents
1 Observationa
Phys333-13s HW6 Solutions
#1 Stellar Collisions
2
hw6-solns.nb
#2 Galactic Orbital Periods
hw6-solns.nb
#3 Virial Mass of Cluster
3
4
hw6-solns.nb
#4 Galactic Rotation from 21 cm Radio observations
hw
Phys333-15s HW4 Solutions
#1 Opacity of people vs. electrons
a.
h = 1.8 m;
w = 0.5 m;
m = 100 cm;
= h * w;
Framed["=" NumberForm[, 4]
= 9000. cm2
b.
m = 60 kg;
kg = 1000. g;
= / m;
Framed["=" Numbe
PHYS-333: Problem set #2
Solutions
Version of March 2, 2017.
1. Visual binary (15 points):
Over a period of 10 years, two stars separated by an angle of 1 arcsec are observed to
move through a full ci
PHYS-333: Problem set #3
Due Friday Mar. 13, 4 p.m., in my office (205 SHL) or mailbox (217 SHL).
Please write neatly and show your work. Answers correct to two decimal places
will receive full credit
PHYS-333: Problem set #1
Solutions
VERSION of February 28, 2017 .
1. Energy flux and magnitude:
a. Suppose two objects have energy fluxes of f and f + f , where f f . Derive
an approximate expression
Welcome to Phys333-13S
Fundamentals of Astrophysics
Course Instructor:
Prof. Stan Owocki
205 Sharp Lab
(302)831-8357
[email protected]
Course Theme
The physical law
!
!Homework Reading Quiz!
!
What is orbital speed of earth around sun, in km/s?!
!
2 au/yr = 30 km/s = 10-4 c!
!
!
How many powers of ten between size scale of people
(1m) and that of the observable u
1
2
3
4
7
9
Hydrogen energy levels
11
Light as Information Bearer
We can separate light into its different wavelengths (spectrum).
By studying the spectrum of an object, we can learn its:
1
PHYS-333: Problem set #3
Due Classtime Mar. 7
Please write neatly and show your work. Answers correct to two decimal places
will receive full credit, so try to compute by hand without a calculator. Bi
Phys333-13s HW4 Solutions
#1 Opacity of people vs. electrons
a. Cross section of standing person
cm =.; h = 1.8 m; w = 0.5 m; m = 100 cm; s = h * w; [email protected], 2D
9000. cm2
b. Opacity for m=60 kg
m
PHYS-333: Problem set #7
Due classtime Tuesday May 10
Please write neatly and show your work. Please put a box around all your final
answers. Answers without a box may not receive credit. Big magnitud