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Light of intensity 10^-5 Wm^-2 falls on ...

Light of intensity `10^-5 Wm^-2` falls on a sodium photocell of surface area `2 cm^2`. Assuming that the top 5 layers of sodium absorb the incident energy, estimate the time required for photoelectric emission on the wave picture of radiation. The work function for the metal is given to be about 2 eV. what is the implication of your answer?

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