Class Notes (904,693)
CA (538,298)
UTSC (32,636)
Astronomy (104)
ASTA01H3 (78)
Lecture 7

Lecture 7 and 8 in class notes

3 Pages
102 Views

Department
Astronomy
Course Code
ASTA01H3
Professor
Rick Halpern

This preview shows page 1. Sign up to view the full 3 pages of the document.
Lecture 7
273.15K = 0oC
Blackbody Curves, Ideal vs Reality
oA blackbody absorbs all radiation falling on it but then
reemits otherwise temperature would not change
oBlackbody curve represents intensity of radiation emitted by
any object over all possible frequencies
oThe peak emission wavelength decreases with temperature
oObject with the suns surface temperature peaks in the
visible spectrum
oThe total amount of energy emitted per unit area increases
temperature as fourth power
oComparison of blackbody curves of four cosmic objects. The
frequencies and
owavelengths corresponding to peak emission are marked.
oA cool, invisible galactic gas cloud called Rho Ophiuchi. At a
temperature
oof 60 K, it emits mostly low-frequency radio radiation.
oA dim, young star (shown red in the inset photograph) near
the center of
othe Orion Nebula. The stars atmosphere, at 600 K, radiates
primarily in the
oinfrared, here falsely coloured to represent differences in
temperature.
oThe Suns surface, at approximately 6000 K, is brightest in
the visible
oregion of the electromagnetic spectrum.
oSome very hot, bright stars in a cluster called Omega
Centauri, as
oobserved by a telescope aboard a space shuttle. At a
temperature of
o60,000 K, these stars radiate strongly in the ultraviolet.
(Harvard College
oObservatory; J. Moran; AURA; NASA)
Wiens Law
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Lecture 7 o 273.15K = 0 C Blackbody Curves, Ideal vs Reality o A blackbody absorbs all radiation falling on it but then reemits otherwise temperature would not change o Blackbody curve represents intensity of radiation emitted by any object over all possible frequencies o The peak emission wavelength decreaseswith temperature o Object with the suns surface temperature peaks in the visible spectrum o The total amount of energy emitted per unit area increases temperature as fourth power o Comparison of blackbody curves of four cosmic objects. The frequencies and o wavelengths corresponding to peak emission are marked. o A cool, invisible galactic gas cloud called Rho Ophiuchi. At a temperature o
More Less
Unlock Document


Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit