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The photoelectric threshold wavelength o...

The photoelectric threshold wavelength of certain material is `6000 overset(@) (A)`. Find the maximum kinetic energy of the ejected photelectros in electron-volts if the wavelength of the incident radiation is `4000 overset(@)(A)`. (Given `h = 6.62 xx 10^- 34 Js and c = 3 xx 108 m//s)`

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