What is work function? [ENDORSED]

Jamie Reniva 1J
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Joined: Wed Nov 15, 2017 3:00 am

What is work function?

What is the work function? Most of the time it's given in a problem, but I don't understand what is the meaning behind it.

Chiara Berruto 1K
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Re: What is work function?  [ENDORSED]

The work function is the amount of energy required to expel a single electron from the metal

FizaBaloch1J
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Re: What is work function?

It is the minimum threshold needed to eject an electron from the metal.

Daniel Cho Section 1H
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Joined: Fri Jun 23, 2017 11:40 am

Re: What is work function?

The book says work function which is also considered threshold energy. Think of it as the limit the incoming photon light has to exceed in order to release the energy as it hits the metal.

I hope this helps. Correct me in places where I might be wrong.

Posts: 32
Joined: Fri Apr 06, 2018 11:05 am
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Re: What is work function?

In order to find the work function or the threshold energy, you either have to set it equal to the energy per photon if given the lowest frequency or subtract the Ek of the electron from the energy per photon. Often it asks for the threshold energy to be in kJ/mol, however, so then you would have to convert the value.

Sarai Ventura 1L
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Joined: Mon Apr 09, 2018 1:39 pm

Re: What is work function?

Work function is the minimum quantity of energy that is required to remove an electron from a metal.

Emily 1E
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Joined: Fri Apr 06, 2018 11:03 am

Re: What is work function?

It is given by the equation energy supplied by a photon - kinetic energy of the ejected electron, or hv - (1/2)mv^2

yazminedesan1F
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Joined: Thu Feb 15, 2018 3:00 am

Re: What is work function?

Its just the energy required to remove an electron

Mei Blundell_1J
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Re: What is work function?

An important point is that it is the amt. of energy required to remove an electron from an atom such that it comes off with zero kinetic energy. There's no energy left over to move the electron away from the atom, only enough to detach it.

Nicole Shak 1L
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Re: What is work function?

Is there an actual equation for the work function, or will it always be given to you?

Tarek Abushamma
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Joined: Fri Apr 06, 2018 11:01 am

Re: What is work function?

The equation to solve for the work function is E(Photon)=Work Function(Threshold Energy) + E(Kinetic)

tmehrazar
Posts: 39
Joined: Fri Apr 06, 2018 11:04 am

Re: What is work function?

i was confused about this too, so it's just that equation?

Eli Esagoff_1I
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Joined: Fri Apr 06, 2018 11:02 am

Re: What is work function?

Work function is just a synonym for threshold energy. It is not an equation, it is the minimum energy needed for an electron to be ejected from a metal. The value is usually given.

Phil Timoteo 1K
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Re: What is work function?

FizaBaloch1J wrote:It is the minimum threshold needed to eject an electron from the metal.

Alondra Juarez section 1E
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Joined: Fri Sep 29, 2017 7:03 am

Re: What is work function?

A work function is the minimum energy needed to remove an electron from a solid surface to a point in the vacuum immediately outside the solid surface.

Sara Veerman-1H
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Joined: Fri Apr 06, 2018 11:05 am

Re: What is work function?

The Work function (threshold energy) is the energy needed to expel one electron from metal in a vacuum.