Threshold Energy


Moderators: Chem_Mod, Chem_Admin

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

Threshold Energy

Postby Hedi Zappacosta 1E » Mon Oct 15, 2018 3:37 pm

What happens to the electron if the energy of the photon is exactly the same as the work function? Is it still removed?

Chem_Mod
Posts: 17949
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 406 times

Re: Threshold Energy

Postby Chem_Mod » Mon Oct 15, 2018 3:43 pm

Yes, an electron is ejected because the threshold has been met. However, the electron's KE is 0 J.

Hedi Zappacosta 1E
Posts: 66
Joined: Fri Sep 28, 2018 12:27 am

Re: Threshold Energy

Postby Hedi Zappacosta 1E » Tue Oct 16, 2018 4:06 pm

Ok thank you!

Sameen Mahmood 3D
Posts: 37
Joined: Wed Jun 13, 2018 3:00 am

Re: Threshold Energy

Postby Sameen Mahmood 3D » Tue Oct 16, 2018 5:20 pm

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.

Hannah Pham 1D
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Threshold Energy

Postby Hannah Pham 1D » Tue Oct 16, 2018 5:35 pm

The electron is still removed, but it just does not have kinetic energy.


Return to “Properties of Light”

Who is online

Users browsing this forum: No registered users and 1 guest