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A zinc ball of radius R 1 cm charged to a potential 0 5 V...

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A zinc ball of radius R 1 cm charged to a potential 0 5 V The ball is illuminated by a monochromatic ultraviolet UV light with a wavelength 290 nm The photoelectric threshold for zinc is 332 nm The potential of ball after a prolonged exposure to the UV is A 0 5 V B 0 V C 0 54 V D 0 79 V

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