E=hv [ENDORSED]

[Chase Yonamine 1J]

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]

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]

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]

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?

[sarahartzell1A]

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]

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

[Anmol_cheema_2F]

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

[KHuang1L]

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]

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]

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]

I understand that...

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]

Here, E would represent the energy of the photon

[AlyssaBei_1F]

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]

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]

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]

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]

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

[Karolina herrera1F]

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]

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

[Daniel Kim 1D]

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

[Sisi Li 1F]

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 2B]

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

[Jasmine Summers 4G]

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

[Nicholas_Gladkov_2J]

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_4F]

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]

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

[Brynne Burrows 3K]

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]

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

[205154661_Dis2J]

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

[305421980]

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]

E is supposed to represent the energy of a photon

[Nyari Muchaka_Discussion 4A]

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]

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

[Joanne Lee 1J]

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]

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 4F]

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]

E represents the energy of the photon.

[Merin Padayatty 3G]

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

[Drew Myers 4G]

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]

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

[PriscillaLi_3G]

E represents the energy of one photon

[jvera4b]

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

[105289321]

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

[105289321]

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

[Isabelle Kim 3E]

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.

[Sarah Hong 2K]

E represents the energy of the photon

[Kimberly_martinez2I]

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.

[Kaitlyn Bateman 1L]

E represents the energy of the photon (so the light source).

[Jillian Sarquiz- 2B]

E is the energy of each photon. The work function is the minimum energy to remove an electron.

[Chem_Mod]

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

[Aashna Bhandari 1L]

Hi! The E in the Bohr Frequency Condition refers to the energy of the photon, which is like a packet of energy.

[masontsang]

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!

[Amanda Dankberg 1B]

In this equation, E is the energy of the photon. The work function is the energy required to remove an electron.