ASTR101_L20_post

ASTR101_L20_post - 3/31/09 Lecture 20 Dr. Silverstone...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3/31/09 Lecture 20 Dr. Silverstone Astr101 Spring 2009 1 Lecture 20 Announcements Lecture 20 Announcements Reminders: HW #7 (Ch 11) is due Friday Night April 3 (at midnight) Midterm #2 in one week! Tuesday April 7 Bring ScanTron answer sheet, #2 pencil, scientific calculator Review Session? Finish Reading Chapters 12,13, & 14 (Jovian Planets & moons) TEST YOUR CLICKER ! Todays Outline: Review of Current Scores on BlackBoard Surface Temperature and Escaping Gases Chapter 15 Asteroids & Comets Kirkwood Gaps Asteroids & Meteorites Comets & Meteor Showers 3/31/09 Lecture 20 Dr. Silverstone Astr101 Spring 2009 2 Lecture 20 Announcements 2.0 Lecture 20 Announcements 2.0 Reminders: HW #7 (Ch 11) is due Friday Night April 3 (at midnight) Midterm #2 in one week! Tuesday April 7 Bring ScanTron answer sheet, #2 pencil, scientific calculator Review Session? Study for your Midterm! Bring Questions about concepts giving you trouble to Thursdays Class! TEST YOUR CLICKER ! Todays Outline: Review of Current Scores on BlackBoard Surface Temperature and Escaping Gases Chapter 15 Asteroids & Comets Kirkwood Gaps Asteroids & Meteorites Comets & Meteor Showers 3/31/09 Lecture 20 Dr. Silverstone Astr101 Spring 2009 3 Current Scores on BlackBoard Current Scores on BlackBoard Maximum score = 70 (the remaining 30 comes from the Final Exam) Average = 47.6 / 70 = 68% 20% iClicker , 20% Homework , 30% Midterm(s), 30% Final Exam Red = expected # of 77 students, % in the Syllabus: A: 20%, B: 30%, C: 30%, D: 15%, F: 5% 3/31/09 Lecture 20 Dr. Silverstone Astr101 Spring 2009 4 Calculating Surface Temperature Calculating Surface Temperature Luminosity = total energy (over all colors) in all directions Flux = energy through a specific surface area = Luminosity / (4 r 2 ) Stephan Boltzman law (1879): Flux from a Blackbody F = T 4 Luminosity of the Sun L Sun = 4 r Sun 2 T Sun 4 What is the temperature of the Suns light at the distance of the Earths orbit?...
View Full Document

This note was uploaded on 05/03/2009 for the course ASTR 101 taught by Professor Christiansen during the Spring '08 term at UNC.

Page1 / 23

ASTR101_L20_post - 3/31/09 Lecture 20 Dr. Silverstone...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online