Astronomy 110 PRINT Name   __________________________
Fall 2005   Section 006

Homework 5 : Light & Atoms

(Due Thursday, Oct 13, 2005)

Light

Answer question 12 on page 126 of the textbook, about the wavelengths of radio signals. Give the answers in appropriate units of length, i.e. ones that minimize the number of zeroes.






































Atoms

The most common atom of iron has 26 protons and 30 neutrons in its nucleus. What are its atomic number, atomic mass, and number of electrons if it is electrically neutral?






Reason:




Consider the following three atoms: Atom 1 has 7 protons and 8 neutrons; atom 2 has 8 protons and 7 neutrons;, atom 3 3 has 8 protons and 8 neutrons. Which two are isotopes of the same element? _______________

Reason:




Which element is this? _______________

Reason:




Consider fluorine atoms with 9 protons and 10 neutrons. What are the atomic number and atomic mass of fluorine? Suppose we could add a proton to this fluorine nuclues. Would the result still be fluorine? _______________

Reason:




How many electrons could a fluorine atom lose, at most? _______________

Reason: