1. Mar 17, 2010 #1

   XTEND

   

   1. The problem statement, all variables and given/known data
   
   Calculate energy of a 0.07078nm photon
   
   2. Relevant equations
   
   E = hc / lamda
   
   3. The attempt at a solution
   
   (6.63x10E-34)(3.0x10E8) / (7.078x10E-11)(1.60x10E-19)
   
   =17563.2 eV
   
   But the correct answer is 17520

    

   XTEND, Mar 17, 2010
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3. Mar 17, 2010 #2

   ideasrule

   

   Homework Helper

   Close enough.

    

   ideasrule, Mar 17, 2010
4. Mar 17, 2010 #3

   XTEND

   

   is it my sig figs?

    

   XTEND, Mar 17, 2010
5. Mar 17, 2010 #4

   ideasrule

   

   Homework Helper

   Yes. You have way more sig figs in your answer than in your input values.

    

   ideasrule, Mar 17, 2010
6. Mar 17, 2010 #5

   XTEND

   

   okay. Do I need to use 4 sig figs for all the values? I'm getting 17514.8 now. It's too low.

    

   XTEND, Mar 17, 2010

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