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Threshold Energy

Posted: Wed Oct 10, 2018 4:06 pm
by Adrienne_4F
Can someone explain what threshold energy is and how it is relevant to today's lecture? Thank you.

Re: Threshold Energy

Posted: Wed Oct 10, 2018 4:08 pm
by Leela_Mohan3L
Threshold energy is the amount of energy required to remove an electron from an atom of a certain material. The electron will only be removed if the light source has enough energy to overcome this threshold energy.

Hope that helps!

Re: Threshold Energy

Posted: Wed Oct 10, 2018 8:27 pm
by Nicole Lee 4E
The threshold energy is the work required to remove an electron from a metal surface. The energy of the photon must be greater or equal to the threshold energy in order to remove an electron from the surface. E(photon) - Threshold Energy = Kinetic Energy of Electron

Re: Threshold Energy

Posted: Wed Oct 10, 2018 8:34 pm
by Rylee Nelsen 3A
The threshold energy is basically the minimum kinetic energy required to remove an electron. Also, the energy of photoelectrons emitted when light hits a metal depends on the frequency. When light with the right frequency is shone onto a metal surface, electrons are emitted from the surface.

Re: Threshold Energy

Posted: Wed Oct 10, 2018 8:42 pm
by leediane0916
Threshold Energy is the minimum required amount of E that a photon should contain for the photon to release an electron from the metal surface. The threshold E + E of the electron is equal to the E of the photon. As explained in the lecture, if the electron's E is 0, that means that the photon's E was equal to the threshold E, leaving no excess E (kinetic E)