Unexpected Results
What photoelectric experiments revealed about frequency, intensity, and electron emission
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Unexpected
As long as you are 1. When you brighten the light source
Get more electron emission
... but
not faster
(more energetic) electrons!!!!
Results Contradict
Wave Theory!
According to
Increasing Brightness,
Should Increase Kinetic Energy
- It Didn't!!
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. Light above the threshold frequency hits a metal. If the light is made brighter, what happens?
2. Making the light brighter does NOT change which of these?
3. According to wave theory, brightening the light should have…
4. The intensity of light shining on a metal is doubled (above threshold). The emitted electrons' maximum kinetic energy…
5. Why were the photoelectric results called "unexpected"?