The longest wavelength that can eject photo electrons from pt is `1950overset@A`. Calculate its work function in electron volt.

Photoelectric threshold wavelength of Tungsten is 2730overset@ A . Calculate its work function in electron volts. ( C = 3 xx 10^8 m//Sec., h = 6.63 xx 10^-34 Js )

The threshold wavelength for silver is 3800overset@ A .Calculate the photoelectric work function for silver in eV.

The longest wavelength in Paschen series is obtained when an electron jumps from

The momentum of electron, if their wavelength is 10overset@A

Radiation of wavelength 120 nm ejects photoelectrons from a plate whose work function is 3.0 eV. If a magnetic field of flux density 4.0 xx10^-5 T is applied parallel to the plate, then the radius of the path followed by electrons ejected normally from the plate with maximum energy will be

The threshold wavelength for photoemission from molybdenum is 2960overset@ A . Its threshold frequency is

A photon of wavelength 3315overset@ A falls on photosensitive material and eject electron of maximum energy 3 xx 10^-19 J . Calculate the work function of the material in eV.

The photo electrons emitted from the surface of sodium metal are

Calculate the momentum of electron, if their wavelength is 2overset@ A .