Summary
Summary Physical Science - Physical science
- Course
- Institution
- Book
Physical science course notes...chapter 23 to 24
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
Test Bank For Physical Science, 13th Edition All Chapters - 9781264129362
-
Test Bank For Physical Science, 13th Edition All Chapters - 9781264129362
-
Grade 12 IEB Physical Science: Gravitational and Electric Fields
Seller
Follow
TGUARD
Content preview
Physical ScienceLecture Notes
Chapter 23 and 24
I. Chapter 24: Stars, Galaxies and the Universe
A. Tools of Modern Astronomy
1. ElectroMagnetic Radiation
a. Electromagnetic Radiation is energy that can travel directly through space
in the form of waves.
b. Parts of a wave:
wavelength
Crest
trough
c. EMR spectrum includes (in order from longest wavelength to shortest
wavelength) radio waves, infrared, visible light, ultraviolet, X-rays and gamma
rays.
d. Visible light waves in order from longest wavelength to shortest wavelength:
Red, Orange, Yellow, Green, Blue and Violet
2. Telescopes: collect and focus EMR
a. Visible Light Telescopes
i. Refracting Telescope: collects and focuses light using convex lenses
ii. Reflecting Telescope: uses a curved mirror to bounce the light onto a
small area
b. Radio Telescope: Uses a large parabolic dish to collect and focus radio waves
3. Spectrographs: break light into its visible components
a. Astronomers use spectrograths to determine temperatures and chemical
composition of the stars they are looking at.
B. Characteristics of Stars
1. Constellation: a group or pattern of stars in the night sky that appeared as symbols or
figures to ancient star gazers
a. Big Dipper, Orion, Gemini, Little Dipper, etc.
2. Distance units
a. AU – astronomical unit – distance from the Earth to our Sun, about 93 million
miles or 150 million kilometers
b. Light Year- distance light would travel in one year- a distance measurement,
not a time measurement!!- 9.5 million million kilometers!
3. Classifying stars: three characteristics used to classify stars: size, temperature
and brightness
a. Size:
i. Neutron star – about 20 kilometers in diameter
ii. White dwarf- about the diameter of the Earth
iii. Medium Size- about the size of our sun
iv. Red Giant- several times the diameter of our Sun
v. Super Red Giant – can be the diameter of our entire solar system
b. Surface Temperature: revealed by the star’s
color
i. Red - about 3,000 degrees Centigrade
ii. Yellow- about 6,000 degrees Centigrade
iii. White – about 10,000 degrees Centigrade
Page 1 of 5
, iv. Blue – about 50,000 degrees Centigrade
Page 2 of 5
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 EFT, 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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TGUARD. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R160,27. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82871 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now