Work function of caesium and platinum are 2.14 eV and 5.65 eV respectively. Which one of the two metals has higher threshold wavelength? Justify.

The work function of caesium metal is 2.14 eV. When Light of frequency 6* 10^14 H_z is incident on the metal is surface, photoemission of electrons occurs. What is the maximum kinetic energy of the emitted electrons ?

The work function of caesium metal is 2.14 eV. When Light of frequency 6* 10^14 H_z is incident on the metal is surface, photoemission of electrons occurs. What is the maximum speed of the emitted photoelectrons ?

The work function for Caesium atom is 1.9 eV. Calculate the threshold wavelength of the radiation. If Caesium is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected electron.