## E=hv

$E=hv$

Chase Yonamine 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

### E=hv

In the equation, E=hv, does E represent the energy of the photon or does it represent the energy required to remove an electron?

anthony_trieu2L
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

### Re: E=hv

The value E represents the energy of the photon. However, you can use the equation E=hv to calculate the energy required to remove an electron after taking into account the kinetic energy. This works because the energy of the photon must be greater than or equal to the energy required to remove the electron.

Stevin1H
Posts: 89
Joined: Fri Sep 28, 2018 12:17 am

### Re: E=hv

E=hv represents the energy of the photon. However, it could also be equal to the energy required to remove an electron if the kinetic energy is 0. This is shown in the formula E(photon) - work function = Kinetic energy. If the Kinetic energy is 0, then the energy of the photon is equal to the work function.

haleyervin7
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

### Re: E=hv

When it says we should be able to calculate the number of photons from this equation, we must have the total energy before we can do that, right?

sarahartzell1k
Posts: 30
Joined: Fri Sep 28, 2018 12:17 am

### Re: E=hv

E represents the energy of the photon but you can also use this equation to find the energy needed to remove the electron, just remember to pay attention to kinetic energy.

Jocelyne Milke 1G
Posts: 73
Joined: Fri Sep 28, 2018 12:25 am

### Re: E=hv

The work function is the energy needed to remove an electron.

Anmol_cheema_2F
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

### Re: E=hv

E represents the energy of the photon, while the work function is the minimum energy needed to remove an electron.

KHuang1L
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

### Re: E=hv

E is the energy of the photon. That equation is used to find the energy of a photon of light going at a certain speed. H is Planck's constant and v is the frequency of the electron. If E is equal to or greater than the threshold energy required to release an electron from an atom, then the electron is released.

Dayna Pham 1I
Posts: 98
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 3 times

### Re: E=hv

E in this case is E(photon). The work function is the energy required to eject an electron in a 1:1 photon:electron interaction.

Keshav Bhatnagar 1H
Posts: 32
Joined: Fri Sep 28, 2018 12:17 am

### Re: E=hv

The E in E = hv represents the energy of a photon. The E in Ek = 1/2(mv^2) represents the excess energy after an electron is removed from a metal.

105085381
Posts: 44
Joined: Fri Sep 28, 2018 12:15 am

### Re: E=hv

I understand that...
Keshav Bhatnagar wrote:The E in E = hv represents the energy of a photon. The E in Ek = 1/2(mv^2) represents the excess energy after an electron is removed from a metal.

...but, can someone please clarify what the specific values are that we need to assign as hv and 1/2(mv^2)? Sorry if this was already stated!

Jayde Felix 4H
Posts: 59
Joined: Fri Sep 28, 2018 12:28 am

### Re: E=hv

Here, E would represent the energy of the photon

AlyssaBei_1F
Posts: 99
Joined: Fri Sep 28, 2018 12:17 am

### Re: E=hv

The E would represent the energy of the photon. The work function or threshold energy would be the energy required to remove an electron.

Cole Elsner 2J
Posts: 88
Joined: Fri Sep 28, 2018 12:25 am

### Re: E=hv

E represents the energy of the photon. h is Plancks's Constant (6.63*10^-34) and v is the calculated or measured frequency of a light source (typically UV or above for these equations)

Jack Hewitt 2H
Posts: 67
Joined: Fri Sep 28, 2018 12:27 am

### Re: E=hv

Chase Yonamine 1K wrote:In the equation, E=hv, does E represent the energy of the photon or does it represent the energy required to remove an electron?

e represents the energy of a photon. The works function represents the energy required to remove an electron.