# Wavelength of electromagnetic radiation

by babbagee
Tags: electromagnetic, radiation, wavelength
 P: 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
 P: 210 $$E=hv$$ $$v=\frac{c}{\lambda}$$ 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
 P: 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.

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