I keep getting “Photoelectric effect” questions wrong in Modern Physics. What's the trap?
thinking very bright low-frequency light can eject electrons.
The usual trap: thinking very bright low-frequency light can eject electrons. How to avoid it: frequency decides IF electrons come out; intensity only decides HOW MANY. Go back to the definition — light ejects electrons from a metal only if its frequency exceeds a threshold, regardless of intensity.
Key point
Photoelectric effect
Common mistake
thinking very bright low-frequency light can eject electrons.
Memory tip
frequency decides IF electrons come out; intensity only decides HOW MANY.
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