E=hv


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Chase Yonamine 1J
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E=hv

Postby Chase Yonamine 1J » Thu Oct 25, 2018 2:20 pm

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
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Re: E=hv

Postby anthony_trieu2L » Thu Oct 25, 2018 2:24 pm

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
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Re: E=hv

Postby Stevin1H » Thu Oct 25, 2018 2:45 pm

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
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Re: E=hv

Postby haleyervin7 » Thu Oct 25, 2018 6:06 pm

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
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Re: E=hv

Postby sarahartzell1k » Thu Oct 25, 2018 6:27 pm

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
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Re: E=hv

Postby Jocelyne Milke 1G » Fri Oct 26, 2018 5:15 pm

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

Anmol_cheema_2F
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Re: E=hv

Postby Anmol_cheema_2F » Fri Oct 26, 2018 11:56 pm

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

KHuang1L
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Re: E=hv

Postby KHuang1L » Sat Oct 27, 2018 10:54 am

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
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Re: E=hv

Postby Dayna Pham 1I » Sat Oct 27, 2018 12:47 pm

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
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Re: E=hv

Postby Keshav Bhatnagar 1H » Sat Oct 27, 2018 6:56 pm

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
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Re: E=hv

Postby 105085381 » Mon Oct 29, 2018 1:10 pm

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
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Re: E=hv

Postby Jayde Felix 4H » Mon Oct 29, 2018 4:03 pm

Here, E would represent the energy of the photon

AlyssaBei_1F
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Re: E=hv

Postby AlyssaBei_1F » Mon Oct 29, 2018 4:28 pm

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
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Re: E=hv

Postby Cole Elsner 2J » Mon Oct 29, 2018 5:09 pm

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
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Re: E=hv

Postby Jack Hewitt 2H » Thu Dec 06, 2018 6:31 pm

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.

jlinwashington1B
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Re: E=hv

Postby jlinwashington1B » Fri Jun 28, 2019 9:25 pm

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?

David Zhang 1B
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Re: E=hv

Postby David Zhang 1B » Fri Jun 28, 2019 10:03 pm

The professor only mentioned metals when talking about the photoelectric effect. Can it happen to other materials as well?

Karolina herrera1F
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Re: E=hv

Postby Karolina herrera1F » Sat Jun 29, 2019 2:20 pm

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?

Zachary Menz 1D
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Re: E=hv

Postby Zachary Menz 1D » Sat Jul 06, 2019 4:54 pm

E in E=hv represents the energy of a photon.

Daniel Kim 1D
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Re: E=hv

Postby Daniel Kim 1D » Sat Jul 06, 2019 6:15 pm

Represents the energy of the photon meanwhile the work function is the amount of energy needed to remove it.

Sisi Li 1F
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Re: E=hv

Postby Sisi Li 1F » Sat Jul 06, 2019 8:25 pm

E is the energy of the photon. The work function, on the other hand, would give you the energy needed to remove an electron.

Michelle Xie 3A
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Re: E=hv

Postby Michelle Xie 3A » Thu Oct 10, 2019 3:11 pm

It represents the energy of a photon, but can be used to find energy needed.

Jasmine Summers 4G
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Re: E=hv

Postby Jasmine Summers 4G » Thu Oct 10, 2019 3:49 pm

E represents the energy of a photon, and change in E can be used to find the difference in energy levels

Nicholas_Gladkov_3H
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Re: E=hv

Postby Nicholas_Gladkov_3H » Thu Oct 10, 2019 10:57 pm

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.

alicechien_1I
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Re: E=hv

Postby alicechien_1I » Fri Oct 11, 2019 12:03 am

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!

Anish Patel 4B
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Re: E=hv

Postby Anish Patel 4B » Fri Oct 11, 2019 12:08 am

E=energy of photon
h=planck's constant (6.626 × 10-34 m^2*kg/s)
v=frequency in Hz

Brynne Burrows 3K
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Re: E=hv

Postby Brynne Burrows 3K » Fri Oct 11, 2019 1:16 am

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.

Elizabeth 4I
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Re: E=hv

Postby Elizabeth 4I » Fri Oct 11, 2019 5:47 am

E represents the energy of a photon, however it also can be used to find energy that is needed.

KenRios_Dis4H
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Re: E=hv

Postby KenRios_Dis4H » Sun Oct 13, 2019 7:58 pm

E in the equation represents energy but can also be used to find the energy needed to remove an electron!

305421980
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Re: E=hv

Postby 305421980 » Sun Oct 13, 2019 10:56 pm

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

Kelsey Ash 1D
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Re: E=hv

Postby Kelsey Ash 1D » Mon Oct 14, 2019 8:37 pm

E is supposed to represent the energy of a photon

Nyari Muchaka_Discussion 4A
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Re: E=hv

Postby Nyari Muchaka_Discussion 4A » Mon Oct 14, 2019 9:17 pm

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.

Heba Mengesha 3D
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Re: E=hv

Postby Heba Mengesha 3D » Mon Oct 14, 2019 9:22 pm

E represents the energy (in joules) of the particle of light.

Joanne Lee 1I
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Re: E=hv

Postby Joanne Lee 1I » Tue Oct 15, 2019 6:08 pm

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.

selatran1h
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Re: E=hv

Postby selatran1h » Tue Oct 15, 2019 8:05 pm

E represents the energy of the photon while work represents the amount of energy it takes to remove the electron from the metal

Jialun Chen 1A
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Re: E=hv

Postby Jialun Chen 1A » Tue Oct 15, 2019 10:11 pm

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).

PriscillaLi_3G
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Re: E=hv

Postby PriscillaLi_3G » Wed Oct 16, 2019 3:33 pm

E represents the energy of the photon.

Merin Padayatty 3G
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Re: E=hv

Postby Merin Padayatty 3G » Sat Oct 19, 2019 9:42 pm

With this particle equation, E represents the energy of the photon.

Drew Myers 3A
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Re: E=hv

Postby Drew Myers 3A » Sat Oct 19, 2019 10:13 pm

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.

kendal mccarthy
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Re: E=hv

Postby kendal mccarthy » Sun Oct 20, 2019 2:07 pm

E represents the energy of the photon, as it is the constant times the wavelength.

PriscillaLi_3G
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Re: E=hv

Postby PriscillaLi_3G » Mon Nov 11, 2019 5:08 pm

E represents the energy of one photon

jvera4b
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Re: E=hv

Postby jvera4b » Mon Nov 11, 2019 9:25 pm

E is the energy of the photon and the work function is the threshold energy, the energy needed to remove an electron.

105289321
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Re: E=hv

Postby 105289321 » Tue Dec 03, 2019 8:07 pm

E represents the energy of the photon, and it is the constant times the wavelength.

105289321
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Re: E=hv

Postby 105289321 » Tue Dec 03, 2019 8:07 pm

E represents the energy of the photon, and it is the constant times the wavelength.


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