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Light of Intensity 105W/m2 falls on a sodium photo-cell of surface area 2cm2 .Assuming that the top 5 layers of sodium absorb the incident energy, estimate time required for photoelectric emission in the wave – picture of radiation.( Effective atomic area of a sodium atom = 1020m2 )

(a)0.607years(b)0.507years(c)9months(d)1208days

 

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