Unformatted text preview: + in the solar photosphere with a view to properly interpret the lines in the solar emission spectrum. Here you will calculate what fraction of the sodium atoms can we expect to be singly ionized. 1) On account of the high energy of the ±rst excited states you may assume that all sodium atoms and ions are in their ground state. The statistical weights are then g = 2 for Na and g = 1 for Na + . Can you explain why this should be so? (Hint: where do you ±nd Na in the Periodic Table?) 2) Using our treatment of hydrogen in class or the notes, estimate the electron density. 3) In which of the three following states would you expect to ±nd most of the sodium: Na (Na I ), Na + (Na II ),or Na ++ (Na III )? The ionization energies are 5.14 eV for Na and 47.29 eV for Na + ( 1 eV = 1 . 6 · 1012 erg). You will need to make an estimate for the statistical weight of Na ++ ....
View
Full
Document
This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.
 Fall '08
 RABE
 Physics, Energy, Work

Click to edit the document details