Exam (elaborations)
21-22 Exam for Introduction to Astrophysics
- Module
- Institution
Exam for Introduction to Astrophysics
[Show more]
Seller
Follow
catsympathetic
Content preview
PHY104PHY472
Data Provided:
Formula sheet and physical constants
Data Provided:
A formula sheet and table of physical constants is attached to this paper.
DEPARTMENT OF PHYSICS & Autumn Semester 2009-2010
ASTRONOMY
DEPARTMENT OF PHYSICS AND ASTRONOMY
ADVANCED QUANTUM MECHANICS 2 hours
Spring 2022
AnswerIntroduction to Astrophysics
question ONE (Compulsory) and TWO other questions, one each from3 hours
section A and section B.
Instructions:
All questions are
Answer all marked
FOUR out offrom
questions ten.Section
The breakdown on the
A and any TWO right-hand
questions from side of B.
Section the
paper is meant as a guide to the marks that can be obtained from each part.
Answering the exam questions should take no more than TWO hours, but you will have THREE
hours in a 24-hour window to complete the exam and upload your answers to Crowdmark.
Make sure you retain time stamped photos/scans of your work in case you experience any
problems with uploading files.
Section A is worth 40 marks in total and all questions in section B are worth 30 marks each.
The breakdown on the right-hand side of the paper is meant as a guide to the marks that can
be obtained from each part.
Cross through any work that you do not wish to be examined.
PHY104 TURN OVER
1
PHY472 TURN OVER
, PHY104
SECTION A
1. A binary system has an apparent V-band magnitude of 9.4 mag.
(a) If the system has a parallax of 3.2 milli-arcsec, and the primary is 1.1 magni-
tudes brighter than the secondary in the V-band, what are the absolute V-band
magnitudes of the two components? [8]
(b) Estimate the spectral types of the components if B-V = +0.1 for the primary and
B-V = +0.3 for the secondary. Justify your answer. [2]
2. (a) Define the terms monochromatic flux and bolometric flux. [2]
(b) A cloud of hot, ionised gas has a monochromatic surface flux Fν [W m−2 Hz−1 ]
given by
2
kν
for ν ≤ 1010 Hz ,
Fν = 2 × 10−26 for 1010 < ν ≤ 5 × 1011 Hz ,
0 for ν > 5 × 1011 Hz,
where k is a constant. Calculate the bolometric surface flux. [8]
3. A compact star cluster consists of 200 identical stars and lies at a distance of 3 kpc.
(a) What would be the apparent visual magnitude of the cluster if each star has an
absolute visual magnitude of 0.5 mag, and dust extinction is neglected? [7]
(b) If an interstellar visual extinction of 1.5 mag per kpc applies, how much fainter
would the cluster appear due to the presence of dust? [3]
4. Spectroscopic observations reveal that the 656.28 nm nebular emission line of hydrogen
is observed at a wavelength of 672.03 nm in a distant galaxy.
(a) What is the recession velocity (in km s−1 ) of the galaxy? [3]
(b) If the present value of the Hubble constant is 70 km s−1 Mpc−1 , what is the dis-
tance to this galaxy in Mpc? [2]
(c) If its physical radius is 5 kpc what is the galaxy’s angular diameter (in arcsec)? [3]
(d) How bright would a Type Ia supernova in the galaxy appear if its absolute visual
magnitude is –19.5 mag? (interstellar extinction may be neglected). [2]
PHY104 CONTINUED
2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller catsympathetic. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.31. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
65040 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now
Recently viewed by you
Summary ·
Samenvatting Media-economie 2021-2022
Exam (elaborations) ·
NUR 221 EXAM 2 LATEST UPDATE GRADED A+
Summary ·
samenvatting DNA-replicatie en mitose
Summary ·
AQA A Level Psychology Revision Guide
Other ·
DT SW Module 1.2 Professioneel werken
Exam (elaborations) ·
REL 100 Quiz 12 well answered to pass
Other ·
LPL4802 ASSIGNMENT 3 SEMESTER 1 – 2023 (577736)
Summary ·
MCAT (score 524) COMPLETE Biology notes
