Calculate the maximum kinetic energy of the emitted photo electrons if the incident radiation on the metal surface is of `8000 A^@`. (Take W = 1.2eV).

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)

The threshold wavelength for a photosensitive metal is 3600 overset(@)(A) . Find the maximum kinetic energy of the ejected photoelectrons when light of 3000 overset(@) (A) incidents on the photosensitive surface. (Given , c = 3 xx 108 m//sec, h = 6.62 xx 10 ^- 34 JS)~