A zinc ball of radius, R=1 cm charged to...

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

`-0.5 v`

`0 v`

`0.54 v`

`0.79 v`

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