Exam (elaborations)
ASTR 1010 FINAL VANDERBILT QUESTIONS AND ANSWERS 2024
- Course
- Institution
ASTR 1010 FINAL VANDERBILT QUESTIONS AND ANSWERS 2024
[Show more]
Content preview
ASTR 1010 FINAL VANDERBILTuniverse age from star clusters - ANSWERS-globular clusters have so many stars
they can hold together forever, oldest ones we have; isochrones map H-R positns
of stars of every possible mass at a certain point in time; turn-off point of
isochrone's m-s shows oldest living star in the bunch; comparison of
hypotheticals' turn-off points to star cluster's turn-off point yields age estimate
for the cluster; universe must be older than oldest (lowest turning point)
observed clusters, 13-14 BY
universe age from expanding universe - ANSWERS-v = HD; given redshifting speed
of galaxy + distance to galaxy, we can get H, which yields time for which universe
has been expanding assuming it has been happening at a consistent speed (which
it isn't); space dust makes stuff look fainter and redder and closer, and different
cepheid types are now known to exist; distinguished cepheids + better dstnc
measrmts = 13.1-14.0 BY
universe age from CBR - ANSWERS-discover it, map fluctuations (COBE + WMAP;
hot and cold spots), calculate power spectrum (spatial frequencies of hot and cold
spots), use Hubble constant to get expansion rate of universe use amounts of
dark energy and dark matter to determine 'flatness' of universe, w = -1 equation
yields answer between 13.5 and 14 BY
parallax - ANSWERS-P = 1/d; inverse of dstnc (pc) = parallax in s of arc
inverse square law for light - ANSWERS-dffrnc in brightness = distance squared
(helps w/ H-R star placemt)
, inverse square law for gravity - ANSWERS-pwr increases proportionally to product
of objs' masses, decreases w/ dstnc squared btwn 2 objs
Wien's law - ANSWERS-T = 0.29 cm K/lambda[sub:max] (cm); temperature
decreases as wavelength increases (helps w/ H-R star placemt)
Stefan-Boltzmann law - ANSWERS-L = 4 [pi] R^2 [sigma] T^4; luminosity increases
with star's size & (more so) temp
mass-energy equivalence - ANSWERS-E = mc^2; energy is contained in mass; more
mass = more energy contained within, more energy for light to convert to matter
wavelength-energy equivalence - ANSWERS-E = hc/lambda; energy decreases as
wavelength increases
Doppler shift - ANSWERS-v/c= (lambda[sub:observed] - lambda[sub:rest]) /
lambda[sub:rest] ; wavelength of obsrvd object increases with speed of the object
Hubble's law - ANSWERS-v = HD; as dstnc to an obj, univrs expands it away faster
also relevant: 1/H= t[sub:H] (Mpc/km/s) = Hbl time; assumes univrs expands @
constant v (it doesn't)
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 or Stuvia-credit 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 Teacher101. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now