Calculate the stopping potential if the wavelength of incident radiation is `4000 A^@` and work function of emitter is 2.415 eV.

Calculate the de-Broglie wavelength of a proton having K.E. 50eV .

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)

Calculate de Broglie wavelength of an electron having kinetic energy 120 eV.

The graph between cut-off potential and frequency of incident radiations in photo-electric effect is