Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Planck Constant Question

  1. Aug 11, 2005 #1

    First time at this site really good.

    So on to the point.How can i calculate the Planck constant so i can compare it with the already known number for it??its for a physics test and i cant find out ...

    Thnx in advance
  2. jcsd
  3. Aug 11, 2005 #2
    You can do this with the photoelectric effect. You know the equation [itex]KE_{max} = hf - \phi[/itex], where [itex]\phi[/itex] is the work function of the metal and [itex]KE_{max}[/itex] is the maximum energy of the emitted electrons. You need to relate that equation to that of a straight line, ie. y = mx + c, then you can calculate a value for h.
  4. Aug 11, 2005 #3
    Because im not that good can you help me more.It will save me

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook