With refrernece to the photoelectric effect,define the terms 'work function' and 'threshold wavelength' for a given metal.On what factors will the following depend during phtotelelctric emission from a metal surface:
the velocity of ejected electrons?

If lamda_o and lamda be the threshold wavelength and wavelength of incident light , the velocity of photoelectron ejected from the metal surface is :

Define work function of metal and photoelectric effect.

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

Work function of a metl surface is 4.2 eV. The maximum wavelength which can eject electrons from this metal surface is:

What do you mean by "free electrons" in metals? Define work function.

Define the term work function of a metal. The threshold frequency of a metal is f_0 when the light of frequency 2f_0 is incident on the metal plate, the maximum velocity of electrons emitted is v_1 , when the frequency of the incident radiation is increased to 5f_0 , the maximum velocity of electrons emitted is v_2 . Find the ratio of v_1 and v_2 .