Posted by **Anon** on Wednesday, September 18, 2013 at 7:19pm.

Calculate the wavelength of a proton with energy 2.45 eV.

Please some help!

- Chemistry -
**DrBob222**, Wednesday, September 18, 2013 at 9:09pm
2.45 eV = 3.92E-19 joules.

Then E = hc/wavelength.

E = joules

h = Planck's constant

solve for wavelength in meters.

- Chemistry -
**Anon**, Thursday, September 19, 2013 at 8:51am
Can you write the result because i found 5.067e-7 and it's wrong.I try it many time in diffrent ways baut I finished with the some result!

- Chemistry -
**Anon**, Thursday, September 19, 2013 at 2:11pm
Finally I found it.We have to do this :

wavelength=h/P

P^2=2*m*E

P=sqrt(2*m*E)

E = joule

h = Planck's constant

m = kg

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