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Can you explain how photoelectric effect was observed instantaneously?

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Time of emission of electrons is 11.4 sec. So the photoelectric emission is not instantaneous in the problem. It takes about 11.4 sec.
In photoelectric emission there is a collision between incident photon and free electron and nucleus, which lasts for very-very short interval of time (10
−9
  sec) hence we say photoelectric emission is instantaneous.
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