- #1
pepe1964
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Hi, I'm a newbie starting to study physics at a later age (45).
I've tried to find an answer to my question in this forum, the internet , books, etc... already.
I'm reading Modern Physics, Tipler & LLewelyn. On p. 139 he presents a diagram illustrating Millikans experiment on work function (photoelectric effect). I've seen this same diagram on numerous other physics websites.
(eg. http://hyperphysics.phy-astr.gsu.edu/hbase/mod2.html#c3"
The treshold frequency of the incident light for an electron of the cathode to be ejected is -in this particular experiment- 43.9 *10^13 Hz.
Now, this corresponds to an energy of E=hf = 43.9 * 10^13 s-1 * 4.136*10^-15 eV s = 1.82 eV
Now my question: which element (metal) was this? Which material has a work function of 1.82 eV? I can't find any.
Am I messing up on this? I'm really stuck. Can someone bring some clarity?
I've tried to find an answer to my question in this forum, the internet , books, etc... already.
I'm reading Modern Physics, Tipler & LLewelyn. On p. 139 he presents a diagram illustrating Millikans experiment on work function (photoelectric effect). I've seen this same diagram on numerous other physics websites.
(eg. http://hyperphysics.phy-astr.gsu.edu/hbase/mod2.html#c3"
The treshold frequency of the incident light for an electron of the cathode to be ejected is -in this particular experiment- 43.9 *10^13 Hz.
Now, this corresponds to an energy of E=hf = 43.9 * 10^13 s-1 * 4.136*10^-15 eV s = 1.82 eV
Now my question: which element (metal) was this? Which material has a work function of 1.82 eV? I can't find any.
Am I messing up on this? I'm really stuck. Can someone bring some clarity?
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