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Threshold Energy

Posted: Mon Oct 15, 2018 3:37 pm
by Hedi Zappacosta 1E
What happens to the electron if the energy of the photon is exactly the same as the work function? Is it still removed?

Re: Threshold Energy

Posted: Mon Oct 15, 2018 3:43 pm
by Chem_Mod
Yes, an electron is ejected because the threshold has been met. However, the electron's KE is 0 J.

Re: Threshold Energy

Posted: Tue Oct 16, 2018 4:06 pm
by Hedi Zappacosta 1E
Ok thank you!

Re: Threshold Energy

Posted: Tue Oct 16, 2018 5:20 pm
by Sameen Mahmood 3D
The electron is still completely dissociated from the atom, it just has no kinetic energy and therefore it doesn't have movement on its own. If it does move, its because the detector has a positive charge, not because the electron has its own kinetic energy since all of the energy given by the photon is used up in meeting the workfunction.

Re: Threshold Energy

Posted: Tue Oct 16, 2018 5:35 pm
by Hannah Pham 1D
The electron is still removed, but it just does not have kinetic energy.