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CSSA Question on Ionising Energy (Quanta to Quarks) (1 Viewer)

astron

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Does anyone actually know where Ionising Energy is supposed to be in the Quanta to Quarks course?

If so, how did you do the question?
 

Chand

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im not sure, i didnt to that Q or finished the topic. A suggestion is that it would somehow be related to the ionising ability in alpha, beta and gamma, and thus how they are used in medicine/agriculture/industry...hope that helps..
 

astron

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actually, it was a calculation question, asking for the ionising energy of a hydrogen atom
 

Saul

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you use that guys equation... ummm... forget his name, but it has rhybergs constant, and you work out the energy if it goes to an infinite quantum number level thingy.
 

jims

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its the energy that's needed to completely remove an electron from an atom.

for this question, you use that equation...yeh i forget the name too...but you put in n(final) as infinity and n(initial) as 1.
now you know the wavelength of the photon needed (which turns out to be 1/-R).
then put that into E=hc/wavelength (it comes out nicely as -hcR) and that should get you -13.6eV
 

deyveed

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ohh
You know this eV stuff, do you just get the energy from E=hf and times that with 931.5 or something to change it to eV?
 

PoLaRbEaR

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Converting joules to eV:
number of joules divided by 1.6x10^-19
 
Last edited:

Mathematician

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.....

For some reason the 1st ionising energy is the electrons total energy in the stationary state given by

E(n)= - ( 2pi k^2 e^4 m)/(h^2 n^2)

I got this from the excel - it works out to be 13.6eV

but i dont know why or if we are required to know this formula along with the other long ones in the xcel book.
 

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