1. ### babbagee

74
Calculate the longest wavelength of electromagnetic radiation that could ionize an atom of each of the following elements:

a) Li; IE1=520.1 kJ/mol

can some one tell me the steps to do this problem.

thanks

2. ### thunderfvck

209
$$E=hv$$

$$v=\frac{c}{\lambda}$$

so...$$\lambda=\frac{hc}{E}$$

E = energy (IN JOULES, not kJ!!)
h = 6.626 * 10^-34 J*s
v = frequency (s^-1)
c = 3.00 * 10^8 m/s (speed of light)
$$\lambda$$ = wavelength

Last edited: Jan 25, 2004
3. ### babbagee

74
thanks,

the only thing that was confusing about this problem was the units. I used the exact equation but my units did not work out. I got an answer in m/atom then some one told me that the atom is ignored for some reason.