anonymous
  • anonymous
Sodium metal used in photoelectric experiment, illuminated with light wavelength 420nm. Stopping potential is .65volts. a. What is sodium's work function? b. What wavelength would produce a stopping potential of 1.69V with the same setup?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
According to wikipedia: The maximum kinetic energy of an ejected electron is given by |dw:1333413483013:dw| where h is the Planck constant and f is the frequency of the incident photon. The term |dw:1333413527953:dw| is the work function (sometimes denoted ), which gives the minimum energy required to remove a delocalised electron from the surface of the metal. With stopping voltage Kmax = e(Vstopping) So can't you just use the velocity of light (which I'm assuming is the speed of light) and the wavelength given to figure out the frequency, and then that frequency multiplied by plank's constant would give you the value equal to this "work function"?
anonymous
  • anonymous
Note though, I'm not familiar at all with this function. I'm just gauging it by my basic knowledge of physics up until magnetism and how I would personally solve this.
anonymous
  • anonymous
I tried solving for the frequency first already, but then I was confused about how to get the work function by itself.

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anonymous
  • anonymous
According to wiki again, http://en.wikipedia.org/wiki/Work_function The work function is just plank's constant multiplied by the the minimum (threshold) frequency of the photon required to produce photoelectric emission. So I'm guessing just use the wavelength given?
anonymous
  • anonymous
errr, use the stopping voltage multiplied by "e" (which is the charge on the photon) to get your kmax, and then use that kmax to find your frequency, and then use your frequency to find your work function?

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