## 2.97

Juanalv326
Posts: 49
Joined: Fri Sep 29, 2017 7:04 am

### 2.97

Geiger counters can detect radioactivity because nuclear radiation consists of particles and radiation of suffi ciently high energy to knock electrons out of atoms. Consequently, this type of radiation is called “ionizing radiation.” What is the longest wavelength of radiation that can be detected by a Geiger counter using argon gas as the ionizing medium?

WHat steps would you take in solving a problem such as this? Specifically how do you solve it?

Aya Shokair- Dis 2H
Posts: 58
Joined: Fri Sep 29, 2017 7:07 am

### Re: 2.97

I haven't solved this problem yet, but I'd assume that you look up the Ionization Energy for Argon (I predict will be relatively high). It will most likely be in units of kJ/mol, so you'll have to convert it to J/atom. This energy will be the amount of energy required to remove the electron in gaseous state. Analogous to the work function of a metal. Now that we have the energy of the the photon required to remove an electron, we can use the E=(hc)/lambda to solve for lambda (wavelength)--your answer.

SantanaRodriguezDis1G
Posts: 56
Joined: Sat Jul 22, 2017 3:00 am

### Re: 2.97

You would start by using the Rydberg equation: E=Z^2hR(1/n^2lower- 1/n^2 upper)