- #1
arcnets
- 508
- 0
Hiya,
I'm about to teach the photoelectric effect in class. Everybody knows that observations contradict the classical prediction. Which is: Stopping voltage schould go up with light intensity. OK.
But I have a problem: What EXACTLY is the classical prediction? I mean, is there a formula that says "stopping voltage as a function of light intensity should be so and so..." and how do I derive this from classical first principles?
thx,
arcnets![Bug Eye :bugeye: :bugeye:](https://www.physicsforums.com/styles/physicsforums/xenforo/smilies/oldschool/bugeye.gif)
I'm about to teach the photoelectric effect in class. Everybody knows that observations contradict the classical prediction. Which is: Stopping voltage schould go up with light intensity. OK.
But I have a problem: What EXACTLY is the classical prediction? I mean, is there a formula that says "stopping voltage as a function of light intensity should be so and so..." and how do I derive this from classical first principles?
thx,
arcnets
![Bug Eye :bugeye: :bugeye:](https://www.physicsforums.com/styles/physicsforums/xenforo/smilies/oldschool/bugeye.gif)