Define work function of a metal .

The work function of a metal is 3.3 xx 10^-19 J . The maximum wavelength of the photons required to eject electron from the metal is :

Two radiations containing photons of energy twice and five times the work function of a metal are incident successively on the metal surface. The ratio of the maximum velocities of the emitted electrons in the two cases will be

Light of wavelength 2000 Å can just eject electrons from a metal surface. Calculate the work function of the metal.

What is the threshold wavelength of a metal if the photoelectric work function of the metal is 5 eV?

The work function for a certain metal is 4.2 eV. Will this metal give photoelectric emission for incident radiation of wavelength 330 nm?

The K.E. of the most energetic electrons emitted from a metallic surface is doubled when the wavelength, lambda of the incident radiation is reduced from 400 nm to 310 nm. The work function of the metal is