Photoelectric Effect Equation

[Kimberly Bauer 4E]

Is there an equation we need to use with the photoelectric effect and if there is what do we use and when do we know when to use it (keywords etc.)?

[Sanjana Munagala_1j]

The equation to use is:
E(photon)= work function(or threshold energy) + Kinetic energy of electron
Honestly I would write down this equation whenever you have a question involving electrons being ejected from a metal.
Hope that helps!

[Isabel Day 1D]

There's 2 equations we use for the photoelectric effect.

E= hv (where E: photon energy, h: Planck's constant= 6.63x10^-34, and v= frequency)
This equation can also be written as E= hc/wavelength (where c: speed of light= 3.00x10^8)
We can use this equation if we're given (1) the energy of the photon of light shined on the metal in the photoelectric effect or (2) the frequency/wavelength of the photons

Ek (kinetic energy)= 1/2mV^2 (where m= mass of the emitted electron and V= velocity of the emitted electron)
We can use this equation to find the excess energy of the emitted electron. Ek= E(photon)- E(remove e)= E(excess)

[zoedfinch1K]

For analyzing the photoelectric effect, questions can ask you about the kinetic energy of an emitted electron or the wavelength needed to eject the electron. For these problems, you would use the equation for the kinetic energy of the electron E_k = 1/2*m_e*v² = and .