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 the magnitude dierence m between these two objects.
(Hi
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 full circle about a point midway between them on the s
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 need to divide by factor 2 to get Vrot*L
[email protected]
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 Observational vs. Physical Properties of Stars
1.1
2 Inferring Astr
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
hw6-solns.nb
#5 Quasar properties from redshift
5
6
hw6-s
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["=" NumberForm[, 2]
=
0.15 cm2
g
c.
e = 0.34 cm2 g; (* DocOnotes
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 circle about a point midway between them on the sky. Supp
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, so try to compute by hand without a calculator. Big m
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 for the magnitude difference m between these two object
Welcome to Phys333-13S
Fundamentals of Astrophysics
Course Instructor:
Prof. Stan Owocki
205 Sharp Lab
(302)831-8357
[email protected]
Course Theme
The physical laws and forces that govern our lives.
e.g. gravity, ele
!
!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 universe?!
!
Log[10 Gly/m] ~ 26!
!
!
What are 3 observab
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:
1Composition
2Temperature
3Velocity
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. Big magnitude
answers should be given in scientic notatio
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 = 60 kg;
kg = 1000 g;
k = s m;
[email protected], 2D
0.15 c
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 magnitude answers
should be given in scientific notation. Answe