Energy of a photon

[XTEND]

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

 

[ideasrule]

Close enough.

 

[XTEND]

is it my sig figs?

 

[ideasrule]

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

 

[XTEND]

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