Photoelectric Effect Equation

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

Photoelectric Effect Equation

Postby SLai_1I » Tue Oct 27, 2020 11:45 am

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
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Re: Photoelectric Effect Equation

Postby KatarinaReid_1B » Tue Oct 27, 2020 12:03 pm

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.

Arezo Ahmadi 2D
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Re: Photoelectric Effect Equation

Postby Arezo Ahmadi 2D » Thu Oct 29, 2020 10:21 pm

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.


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