Ionizing an electron with light


by Julian Rose
Tags: electron, ionizing, light
Julian Rose
Julian Rose is offline
#1
Mar26-12, 07:24 PM
P: 1
What wavelength of light ,λ, would be necessary to ionize an electron at n = 2 in a hydrogen atom?

In my notes there are two equations that seem relevant to my question they are:

E=hc/λ and -2.18 x 10-18 J((Z^2/n final^2)-(Z^2/n initial^2))

where h is planks constant, c is the speed of light, Z is the atomic number of the element, in my case hydrogen, and n is the state the electron is in. I think it means energy state.

I tried to think of something, but I don't know. What does it mean by ionizing an electron??
Phys.Org News Partner Science news on Phys.org
Cougars' diverse diet helped them survive the Pleistocene mass extinction
Cyber risks can cause disruption on scale of 2008 crisis, study says
Mantis shrimp stronger than airplanes
chemisttree
chemisttree is offline
#2
Mar27-12, 12:01 PM
Sci Advisor
HW Helper
PF Gold
chemisttree's Avatar
P: 3,725
Quote Quote by Julian Rose View Post
...I tried to think of something, but I don't know. What does it mean by ionizing an electron??
It should have been worded "ionizing a hydrogen atom", as ionization is defined as the removal of an electron from an atom or molecule. So your question asks you to calculate how much energy does it take to completely remove an electron from hydrogen that has its electron already excited to the n=2 orbital and then convert that energy into a wavelength of light.


Register to reply

Related Discussions
ionizing chambers Nuclear Engineering 1
Ionizing Radiation High Energy, Nuclear, Particle Physics 4
Ionizing Air Guns General Physics 1
Ionizing Radiation Introductory Physics Homework 0
ionizing energy Advanced Physics Homework 7