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Problem 1: Photoelectric effect [4 marks] Consider a zinc surface that is 100 cm away from a 100-watt light bulb. Suppose tha

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energy radiated 10 100 a) intensity at a distance r for a point source 10 4x ir2 b) absorbed power P=IA 10 4 x 416 r2 10 10 1energy equal to work function E-4.3 x 1.6 x 1019J time required 4.3 × 1.6 × 10-19 0.625 x 1020 t 110.08s 110.08 60 t-1.835min

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