Talk:Photoelectric effect

message: The end of the second paragraph states that Einstein was correct, but it does not say what he was correct about. — Preceding unsigned comment added by 66.92.187.113 (talk) 22:22:50, March 21, 2007 (UTC)
:The last revision before the previous comment does have that problem in the third paragraph (first paragraph in the "Introduction" section). Brian Jason Drake 08:14, 16 October 2009 (UTC)
thread_title:  Einstein was correct 

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thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: Article currently says;
:Einstein was awarded the Nobel Prize in 1921 
The following is in my Nobel Prize book, and some official-looking Nobel site;
Einstein was awarded the Nobel Prize in 1922 for 1921. The award was “reserved” in 1921. MBG02 (talk) 22:19, 6 September 2018 (UTC)
replies: text: --Thrasymedes (talk) 19:41, 2 February 2020 (UTC)
thread_title:  Just like an Oscar 

message: I came to this article from a Google search looking for a place to start background research on the photoelectric effect but the article is a mess, especially the lead. As flagged already, the lead is way too long. Beyond this, Heinrich Hertz is not mentioned but should be. The entire lead lacks a single primary source. Photoemission-specific review articles are absent as well. Unfortunately, I don't have time at present to conduct an overhaul, but would encourage others to take a look and start making corrections if possible. I might be able to get around to doing some of this myself sometime in the next year or so. A few suggested references to add in might be H. Hertz, Ann. Physik 31, 983 (1887) [referenced in places other than the lead as Ref. 22], the review article by H. P. Bartel Ch. Kleint: Prog. Surf. Sci. 49, 107 (1995), and the textbook Photoelectron Spectroscopy by Stefan Hufner. Csmallw (talk) 18:18, 19 July 2019 (UTC)
thread_title:  The lead needs work 

message: In the "Theoretical explanation" section the article states "In 1905, Einstein proposed a theory of the photoelectric effect using a concept first put forward by Max Planck that light consists of tiny packets of energy known as photons or light quanta."
In 1900 Planck derived his well known black body radiation formula by requiring resonators (oscillating charges) comprising the wall of the black body cavity to take on only integral multiples of energy hf (E_resonator = nhf, where n is an integer). A number of reputable physics histories point out that he continued to believe electromagnetic radiation emitted and absorbed by the resonators was continuous and wavelike (not quantized). Planck did not comfortably relinquish his devotion to the well established classical (Maxwell) description of continuous radiation even after Einstein's 1905 paper proposed light quanta as a fitting explanation for the photoelectric effect. 
As late as 1913, in his recommendation of Einstein to the Prussian Academy of Science, Planck stated:
“That sometimes, as for instance in his hypothesis on light quanta, he may have gone overboard in his speculations should not be held against him.” 74.119.23.6 (talk) 00:11, 18 December 2022 (UTC)
thread_title:  Planck rejected the concept of photons (light quanta) as late as 1913 

message: I have edited the 20th century section to remove the idea that Lenard or anyone else studied the frequency dependence of the photoelectric effect before 1905. There were no such experiments. He predicted the effect. Took 10 years to verify.
Added a ref to a historical analysis: 
Lenard made no attempt in this study or in subsequent studies to correlate light frequency with electron velocity. Johnjbarton (talk) 03:51, 8 July 2023 (UTC)
thread_title:  Einstein's photoelectric effect paper did not agree with frequency dependence experiments.