Chemistry
posted by Anon on .
Calculate the wavelength of a proton with energy 2.45 eV.
Please some help!

2.45 eV = 3.92E19 joules.
Then E = hc/wavelength.
E = joules
h = Planck's constant
solve for wavelength in meters. 
Can you write the result because i found 5.067e7 and it's wrong.I try it many time in diffrent ways baut I finished with the some result!

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