Photoelectric Effect

AP Chemistry· difficulty 3/5

The photoelectric effect demonstrates that light

A
$Is unaffected by matter$
B
$Carries continuous energy$
C
$Is purely a wave$
D
$Has particle character — electrons are ejected only above a threshold frequency$
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Explanation

Below the work function, no photoelectrons emerge regardless of intensity — quantized photon energy must exceed the threshold.

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