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Energy of a photon

  • Thread starter XTEND
  • Start date
  • #1
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Homework Statement



Calculate energy of a 0.07078nm photon

Homework Equations



E = hc / lamda

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
 

Answers and Replies

  • #2
ideasrule
Homework Helper
2,266
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Close enough.
 
  • #3
19
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is it my sig figs?
 
  • #4
ideasrule
Homework Helper
2,266
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Yes. You have way more sig figs in your answer than in your input values.
 
  • #5
19
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okay. Do I need to use 4 sig figs for all the values? I'm getting 17514.8 now. It's too low.
 

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