What did the results of photoelectric-effect experiments establish?
A) Electrons are emitted as soon as low-intensity, high-frequency light hits a metal surface.
B) Electrons are never emitted if low-intensity light waves strike a metal surface.
C) Electrons are emitted if low-intensity light has been incident on metal for a long time.
D) Electrons are emitted if high-intensity light has been incident on metal for a long time.
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