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Light of intensity 10^(-5)Wm^(-2) falls ...

Light of intensity `10^(-5)Wm^(-2)` falls on a sodium photocell of surface area `2cm^(2)`. Assuming that the top 5 layers of sodium absorb the incident energy, estimate the time required for photoelectric emission in the wave picture of radiation. The work function of the metal is givent to be about 2eV. What is the implication of your answer? effective atomic area `=10^(-20)m^(2)`.

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