HOMEWORK #2 - Tufts University

HOMEWORK #2

Homework set #2(due Tuesday Oct. 2nd before class)

Problems (2.)6 (70 points), (2.)7 (30 points), (2.)8 (40 points), and (2.)12 (60 points). Total available points: 200.Bonus problem: (2.)14 (20 points, i.e., 10%)

The Interaction of Light and Matter (lecture 6+)

Lecture notes... plus Chapter 5 & 8 in Carroll&Ostlie OR Chapter 3 & 5 in the Customized book for more details...

Lower Temperature

Peak @ longer wavelengths; less energy emitted per unit of area

Stars are not perfect blackbodies!

2

MAXWELL-BOLTZMANN EQ.

MAXWELL-BOLTZMANN EQ.

Combining Boltzmann eq. with Saha’s eq.

All electrons on ground energy level, hence none are on the 1st excited level to make upper transitions => no Balmer lines

Temperature is right for significant electrons to be excited on the 1st excited level => Balmer lines

Temperature is so large, Hydrogen atoms are ionized, so no electrons => no Balmer lines

Hertzsprung-Russell(HR) diagram