What is the energy of a 0.07078nm photon?

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Homework Help Overview

The problem involves calculating the energy of a photon with a wavelength of 0.07078 nm, using the equation E = hc / λ. Participants are discussing the accuracy of the calculated energy value and the implications of significant figures.

Discussion Character

  • Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants are examining the calculation of photon energy and questioning the impact of significant figures on the final result. There is an exploration of whether the number of significant figures used in the input values affects the accuracy of the answer.

Discussion Status

The discussion is ongoing, with participants providing feedback on the original poster's calculation and raising questions about significant figures. There is no explicit consensus on the correct approach yet, but guidance regarding significant figures has been offered.

Contextual Notes

Participants are considering the appropriate number of significant figures based on the input values provided in the problem statement.

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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
 
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Close enough.
 
is it my sig figs?
 
Yes. You have way more sig figs in your answer than in your input values.
 
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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