Photoelectric Effect (5 of 8) Cut-Off Frequency, An Explanation

An explanation of what the cut-off frequency is for the photoelectric effect. Includes a demonstration using one of the simulations from PhET simulations.The cut-off frequency is the minimum frequency of incoming light below which no photoelectrons will be emitted.

The photoelectric effect is the emission of electrons when light is shined on a material. Electrons emitted in this way can be called photoelectrons.

In 1905, Albert Einstein published a paper advancing the hypothesis that light energy is carried in discrete quantized packets to explain experimental data from the photoelectric effect. This was a key step in the development of quantum mechanics. In 1914, Millikan's experiment supported Einstein's model of the photoelectric effect. Einstein was awarded the Nobel Prize in 1921 for his discovery of the law of the photoelectric effect.

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[alesarhamati]

The best illustration and explanation of the photoelectric effect I've ever come across! Many thanks to you sir.

[chineduobodoeshike]

You are doing a great job sir, please can you do a video about a circuit containing more than one voltage source

[dorkyface]

Thank you, sir, this was exactly what I needed explained! I can't believe this doesn't have more views/likes, although I guess this a very niche subject for a very specific set of students ^.^

[jawahirkhan]

You have the best physics channel on YouTube. If you were my teacher, I would get no less than A. Please don't ever stop making videos. Students like me need teachers like you. Where can I request videos on specific topics? Thanks so much for everything.

[drishtigill]

Are cutoff frequency and threshold frequency same??

[شيمابرهانفرج]

Suppose classical physicists had the idea of plotting 𝑲𝒎𝒂𝒙 versus
f as in Figure. Draw a graph of what the expected plot would look like, based on the wave model for light.. Would you answer me please ! and thanks