## Photoelectric Effect Equation

SLai_1I
Posts: 37
Joined: Wed Sep 30, 2020 9:52 pm

### Photoelectric Effect Equation

Can EK's (the energy of the ejected electron in the photoelectric effect) properties like wavelength and frequency be found using the E=hv equation? Or do you have to use EK=(1/2)mv^2 and DeBrogile's equation?

KatarinaReid_1B
Posts: 72
Joined: Wed Sep 30, 2020 9:41 pm
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### Re: Photoelectric Effect Equation

E=hv and c=frequency x wavelength are equations that only work for massless matter(i.e. electromagnetic radiation/photons). Anything with mass, so electrons, protons, everyday objects, abide by classical mechanics, 1/2mv^2 for kinetic energy, and de broglie's for wavelength.

Posts: 46
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### Re: Photoelectric Effect Equation

E=hv is an equation that is measured in Joules per photon, as this equation can be used to find the energy of the incident light, which contains photons. Therefore, when considering these units of Joules per photon, the energy of ejected electrons cannot be found using the equation E=hv, particularly because the units are different if this helps to understand the concept better.