The work function (Φ) of a photoelectricmaterial is the energy that a
photon of light must possess to just expel an electron from thesurface of
the material. The corresponding frequency of the light is thethreshold
frequency (νth) and Φ = h νth. The higher the energy of theincident
radiation, the more kinetic energy that ejected electrons have inmoving
away from the surface. The work function for cesium is 3.42 X10-19J.
1. What is the threshold frequency for the photoelectric effectfor
cesium.
2. Will 1000 nm infrared radiation produce the photoelectric effecton
cesium? Explain and show calculations.
3. A 425-nm blue light shines on a piece of cesium. Will thisradiation
produce a photoelectric effect? Show calculations as in B.
1
answer
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12 Dec 2019
In the photoelectric effect, the energy of the absorbed photon Is equal to the sum of the energy for the threshold frequency of the metal and the kinetic energy of the ejected electron. When light with a wavelength of 379 nm strikes a metal, the ejected electrons have a kinetic energy of 1.60 x 10^-19 J. What is the photoelectric threshold frequency (in s^-1) for the metal.
In the photoelectric effect, the energy of the absorbed photon Is equal to the sum of the energy for the threshold frequency of the metal and the kinetic energy of the ejected electron. When light with a wavelength of 379 nm strikes a metal, the ejected electrons have a kinetic energy of 1.60 x 10^-19 J. What is the photoelectric threshold frequency (in s^-1) for the metal.
Casey DurganLv2
13 Dec 2019
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