{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

set2-06

# set2-06 - emission regions along a line of sight Region 1...

This preview shows page 1. Sign up to view the full content.

Astro 346, Spring Semester 2006 Homework, 2nd set, return before Friday, February 10, 2pm. Don’t forget to give your name. Problem 1: Radiation transport (13 P) a) A gas can emit continuum emission and lines. How does the optical depth at the frequency of a line compare with the optical depth at neighboring frequencies? b) Sketch the emission spectrum of thermal gas as a function of the optical depths for lines and continuum (in the limits much smaller or much larger than unity). Always draw a Planckian for comparison. How many different cases would you distinguish? c) Suppose we see two homogeneous emission regions along a line of sight.
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: emission regions along a line of sight. Region 1 in the background has a high optical depth, τ 1 À 1 , and temperature T 1 . Region 2 is in the foreground and has the optical depth τ 2 and temperature T 2 . Repeat the exercise of part b) by varying τ 2 , now also discriminating the two cases T 2 À T 1 and T 2 ¿ T 1 . Again draw Planckians for comparison. Problem 2: Energy transport by radiation (7 P) Do problem 5.11 in the textbook. Explicitly write down the calculation and explain your arguments in a few lines of text, whenever it says argue, verify, or compute....
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern