E=hv [ENDORSED]
Moderators: Chem_Mod, Chem_Admin
-
- 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?
-
- 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.
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.
-
- 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?
-
- Posts: 56
- 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.
-
- Posts: 73
- Joined: Fri Sep 28, 2018 12:25 am
-
- 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.
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.
-
- 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.
-
- 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.
Re: E=hv
I understand that...
...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!
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!
-
- Posts: 59
- Joined: Fri Sep 28, 2018 12:28 am
-
- 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.
-
- 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)
-
- 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.
-
- Posts: 65
- Joined: Fri Sep 28, 2018 12:22 am
Re: E=hv
I know that E represents the energy of the photon, while the equation itself represents electron removal... In lecture today Professor Lavelle showed us an example of the electron removal from a metal. My question is can electrons be removed anywhere?
-
- Posts: 48
- Joined: Mon Jun 17, 2019 7:23 am
Re: E=hv
The professor only mentioned metals when talking about the photoelectric effect. Can it happen to other materials as well?
-
- Posts: 33
- Joined: Sat Feb 02, 2019 12:15 am
Re: E=hv
I don't think electrons can be removed from anymore I think there is more like a specific way in which it can be removed only. Maybe when it is jumping off the metal only?
-
- Posts: 32
- Joined: Wed Nov 07, 2018 12:17 am
-
- Posts: 38
- Joined: Wed Oct 03, 2018 12:17 am
Re: E=hv
Represents the energy of the photon meanwhile the work function is the amount of energy needed to remove it.
-
- Posts: 34
- Joined: Mon Mar 11, 2019 12:15 am
Re: E=hv
E is the energy of the photon. The work function, on the other hand, would give you the energy needed to remove an electron.
-
- Posts: 99
- Joined: Sat Aug 17, 2019 12:18 am
-
- Posts: 50
- Joined: Wed Sep 18, 2019 12:17 am
Re: E=hv
E represents the energy of a photon, and change in E can be used to find the difference in energy levels
-
- Posts: 125
- Joined: Sat Aug 17, 2019 12:17 am
Re: E=hv
Keshav Bhatnagar 1H 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.
Just to clarify, if there is excess energy after the electron is ejected, that energy would be converted to kinetic energy (Ek). The v in the equation Ek=1/2(mv^2) refers to the velocity of the electron, correct? Because surely it is not referring to nu, as in E=hv.
-
- Posts: 104
- Joined: Sat Jul 20, 2019 12:15 am
Re: E=hv
Nicholas_Gladkov_3H wrote:Just to clarify, if there is excess energy after the electron is ejected, that energy would be converted to kinetic energy (Ek). The v in the equation Ek=1/2(mv^2) refers to the velocity of the electron, correct? Because surely it is not referring to nu, as in E=hv.
Correct, the v refers to the velocity of the electron and not nu. This is because kinetic energy deals with objects in motion, so having v represent the velocity of a moving object makes sense in this context. Hope this helps clarify the difference!
-
- Posts: 59
- Joined: Thu Jul 11, 2019 12:17 am
-
- Posts: 52
- Joined: Thu Jul 25, 2019 12:16 am
Re: E=hv
E in this equation represents the energy of the photon. In some cases, 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.
-
- Posts: 10
- Joined: Fri Aug 02, 2019 12:16 am
Re: E=hv
E represents the energy of a photon, however it also can be used to find energy that is needed.
-
- Posts: 109
- Joined: Wed Sep 18, 2019 12:21 am
Re: E=hv
E in the equation represents energy but can also be used to find the energy needed to remove an electron!
Re: E=hv
haleyervin7 wrote: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?
yes, it needs to b e calculated from the work function and kinetic energy values given
-
- Posts: 50
- Joined: Wed Sep 18, 2019 12:16 am
-
- Posts: 53
- Joined: Thu Sep 19, 2019 12:17 am
Re: E=hv
E=hv is to find the energy of a photon(light) and is usually coupled with the c=lambdaxvelocity because c represents the speed of light. When combined these two equations create the E=hc/lambda equation. If you want to find the energy contained in an electron, you would use the De Broglie equation as it is a different form of energy.
-
- Posts: 50
- Joined: Sat Sep 07, 2019 12:19 am
-
- Posts: 100
- Joined: Thu Jul 25, 2019 12:15 am
Re: E=hv
The E represents the amount of energy of a photon but you can always compare that E value to the work function value to determine whether the E amount is enough to remove the electron from one shell to another.
-
- Posts: 52
- Joined: Fri Aug 30, 2019 12:16 am
Re: E=hv
E represents the energy of the photon while work represents the amount of energy it takes to remove the electron from the metal
-
- Posts: 108
- Joined: Sat Sep 07, 2019 12:16 am
Re: E=hv
E=hv is the incoming energy of electromagnetic radiation (photon). The energy needed to remove electron is the work function (represented by a greek alphabet).
-
- Posts: 63
- Joined: Fri Sep 27, 2019 12:30 am
-
- Posts: 52
- Joined: Thu Jul 11, 2019 12:16 am
-
- Posts: 100
- Joined: Sat Aug 17, 2019 12:17 am
Re: E=hv
E represents the energy of the photon. The energy required to remove an electron is known as the work function/threshold energy and is not present in this equation.
-
- Posts: 109
- Joined: Wed Nov 14, 2018 12:22 am
-
- Posts: 63
- Joined: Fri Sep 27, 2019 12:30 am
-
- Posts: 131
- Joined: Fri Sep 24, 2021 6:17 am
- Been upvoted: 1 time
Re: E=hv
This equation is an approximate measurement of a photon (aka "packet of energy"), whereby the intensity is dependent on the frequency of the photon. Lower frequency would indicate less energy measured from that particular photon and vice versa.
-
- Posts: 102
- Joined: Fri Sep 24, 2021 5:48 am
-
- Posts: 104
- Joined: Fri Sep 24, 2021 6:25 am
Re: E=hv
Chase Yonamine 1J 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 the photon.
-
- Posts: 100
- Joined: Fri Sep 24, 2021 6:52 am
-
- Posts: 113
- Joined: Fri Sep 24, 2021 6:29 am
Re: E=hv
E is the energy of each photon. The work function is the minimum energy to remove an electron.
-
- Posts: 23858
- Joined: Thu Aug 04, 2011 1:53 pm
- Has upvoted: 1253 times
Re: E=hv [ENDORSED]
Hi Chase,
E=hv refers to the general equation to solve for the energy of a photon
The energy of a photon required to eject an electron from a material’s surface is referred to as the work function/binding energy of the surface.
We can calculate the work function
BE (work function) = h x fo (where fo is equal to the threshold frequency of the surface, the required frequency to eject an electron from the surface.)
We can also relate the work function to kinetic energy
KE = hv - work function
E=hv refers to the general equation to solve for the energy of a photon
The energy of a photon required to eject an electron from a material’s surface is referred to as the work function/binding energy of the surface.
We can calculate the work function
BE (work function) = h x fo (where fo is equal to the threshold frequency of the surface, the required frequency to eject an electron from the surface.)
We can also relate the work function to kinetic energy
KE = hv - work function
-
- Posts: 102
- Joined: Fri Sep 24, 2021 7:06 am
Re: E=hv
Hi! The E in the Bohr Frequency Condition refers to the energy of the photon, which is like a packet of energy.
-
- Posts: 52
- Joined: Fri Sep 24, 2021 5:09 am
Re: E=hv
Hi!
In the equation E=hv, E represents the energy of the photon, h is the Planck constant, and v is the frequency of the photon. The energy needed to remove an electron is represented in the work function!
I hope this helps!
In the equation E=hv, E represents the energy of the photon, h is the Planck constant, and v is the frequency of the photon. The energy needed to remove an electron is represented in the work function!
I hope this helps!
-
- Posts: 95
- Joined: Fri Sep 24, 2021 5:35 am
Re: E=hv
In this equation, E is the energy of the photon. The work function is the energy required to remove an electron.
Who is online
Users browsing this forum: No registered users and 2 guests