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)~

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 maximum velocity of ejected photoelectrons 2 xx 10^6 m/sec and (e/m) of electrons is 1.8 xx 10^11 coul/kg. The stopping potential in volts is

Calculate the energy of the photon of wave-length 4500A. Given h= 6.6xx10^(-34) J sec.

Calculate the de Brogilie wavelength of a proton having kinetic energy 50 eV. (m_p = 1.67 xx 10^-27 kg. h = 6.62 xx 10^34J-s)