Physics Aviary Assignment - Modern Physics

1. Go to the Physics Aviary website.

2. Click the "Search" tab in the top row

3. Click "HW" from the Program Type drop-down menu

4. Click "Modern" in the Unit drop-down menu

5. Click "AP Physics 2" in the Class drop-down menu

6. Click Find Program

7. Complete the following Problems

Make sure you see the two notes below!!

--> Half-Life from a Graph

--> Half-Life from Data

--> Light From Atom

--> Half-life and Decay Constant from Data

--> Photoelectric Problem

--> Threshold Frequency Problem

Note!!!  In the Half-life and decay constant from data problem, it asks you to calculate the "decay constant."  The equation for this is: Half-life = 0.693/decay constant.  So, take 0.693 divided by your half life and that is the value of the decay constant.  The reason 0.693 is the number is that is the natural log of 2.  You can also find the equation                                           N = No * e^(-decayconstant * t),  in which No is the original number of radioactive atoms and N is the numbers of left over radioactive atoms after time t has passed.  If you want to know why these are the equations, check out page 929 in the Giancoli.  But the basic idea is that radioactivity is an exponential process, so we see the e function.  And natural log is how you get those terms out of the e function's exponent.  You can find these equations on your blue equation sheet.   

Note #2!!!!  Looks like the graphing program is not really that great to solve the Half-life from Data problem on Physics Aviary.  Use Desmos or Graphical Analysis - the problem is pretty easy when you actually have a good graphing program.  To use graphical analysis, go to graphicalanalysis.app and use the license key.  Email me if you want the license key as I can't post it on this public website.