When ultraviolet light of wavelength 25410-5 cm and, Physics

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When ultraviolet light of wavelength 25410-5 cm and

When ultraviolet light of wavelength 2.54*10^-5 cm and intensity 0.5 mW/cm² form a mercury arc falls upon a clean copper surface, the stopping potential necessary to stop the emission of the photo-electrons is 0.59 V.

a) What would be the stopping potential if the intensity was increased to 1.0 mW/cm² ?

b) What would be the threshold wavelength for copper?

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Physics: When ultraviolet light of wavelength 25410-5 cm and

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Physics: When ultraviolet light of wavelength 25410-5 cm and

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